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atomic weight definition

It can also be defined as the weight of a distinct unit of an element or the amount of matter of the sole weight of an isotope (a variant of a … Proper usage and audio pronunciation (plus IPA phonetic transcription) of the word atomic weight. However, in the 1951 report, the committee added a footnote to sul-fur indicating that a variation factor (0.003) should be attached to its atomic-weight value to account for atomic-weight variations in naturally occurring sources of sulfur. Atomic Mass - Atomic mass is the mass of an atom or other particle, expressed in unified atomic mass units (u). A quality in natural bodies, by which they tend towards the centre of the earth. Learn a new word every day. Basis for the atomic weight unit Before 1961, a unit of atomic weight was based on 1/16 (0.0625) of the weight of an oxygen atom. What does atomic weight mean in finance? Define atomic weight. These example sentences are selected automatically from various online news sources to reflect current usage of the word 'atomic weight.' Learn more. For synthetic elements, there is no natural isotope abundance. Likewise, we can calculate the atomic weight of any element considering the isotopes and their abundance. Since the atomic weight is what is often the only item of interest, it might also … atomic weight Definition Englisch, atomic weight Bedeutung, Englisch Definitionen Wörterbuch, Siehe auch 'atomic age',atomic bomb',atomic clock',atomic cocktail', synonyme, biespiele The atomic weight is simply the weight of one mole (6.022×10^23 atoms) of an element. Under the article Measure, (q.v.) Its concept is fundamental as most of the chemical reactions occur according to the simple numeric relationships between the atoms. Atomic mass can be expressed in grams. It is the weighted average of the masses of naturally-occurring isotopes. But all elements obey the law of definite proportions when they combine with other elements, so they behave … wt. The number of positively charged particles is what they call the 'atomic number,' and these particles, together with the uncharged particles, make up the 'atomic weight. A relative atomic mass (also called atomic weight; symbol: A r) is a measure of how heavy atoms are. Atomic weight and atomic mass are two important terms that we often use in chemical calculations. 2. in statistics, the process of assigning greater importance to some observations than to others, or a mathematical factor used to apply such a process. Usage examples of "atomic weight". The Nuttall Encyclopedia (0.00 / 0 votes)Rate this definition: Definition of atomic weight in the Definitions.net dictionary. Définition atomic weight dans le dictionnaire anglais de définitions de Reverso, synonymes, voir aussi 'atomic age',atomic bomb',atomic clock',atomic cocktail', expressions, conjugaison, exemples Definition of Atomic Mass Atomic mass is defined as the number of protons and neutrons contained in an individual unit of a substance. What does atomic weight mean? The atomic weight is the average mass of the atoms of an element , calculated using the relative abundance of isotopes in a natural element. WEIGHT. Definition of Atomic weight. atomic weight definition in English dictionary, atomic weight meaning, synonyms, see also 'atomic age',atomic bomb',atomic clock',atomic cocktail'. Test Your Knowledge - and learn some interesting things along the way. 'Nip it in the butt' or 'Nip it in the bud'. ‘The sum of the atomic mass of the protons and neutrons determines the atomic mass or atomic weight of the nucleus.’ ‘Hydrogen is the lightest element, so it provides a convenient unit for measuring the relative atomic weights of the other elements.’ ‘It has an atomic number of 101 and an approximate atomic weight of 258.’ atomic weight meaning: 1. another term for relative atomic mass specialized 2. another term for relative atomic mass…. n. The mass of an atom, usually expressed in atomic mass … The value is given within brackets so that it's understood it's the nucleon count and not a natural value. n. The average mass of an atom of an element, usually expressed relative to the mass of carbon 12, which is assigned 12 atomic … 1. Send us feedback. In other words, a relative atomic mass tells you the number of times an average atom of an element from a given sample is heavier than one-twelfth of an atom of carbon-12. The unit is dimensionless. atomic weight definition: 1. another term for relative atomic mass specialized 2. another term for relative atomic mass…. Relative Isotopic Mass - This is the ratio of the mass of a single atom to the mass of a unified atomic mass unit. However, most scientists agree that an exception can be made by allowing atomic weights to be dimensionless. The standard atomic weight of a chemical element is the weighted arithmetic mean of the … Former term for the more specific relative atomic mass. Standard Atomic Weights. 1 atomic mass unit is defined as 1/12 of the mass of a single carbon-12 atom. 1922, Leicester F. Hamilton, Calculations of Analytical Chemistry, page 38: The equivalent weight of an element or compound is that weight equivalent in reactive power to one atomic weight of hydrogen. It can also be defined as the weight of a distinct unit of an element or the amount of matter of the sole weight of an isotope (a variant of a particular chemical element). The atomic weight is the average mass of the atoms of an element, calculated using the relative abundance of isotopes in a natural element. Usually carbon, with a weight of 12, is used as the basis. Under the article Measure, (q.v.) Prior to 1961, a unit of atomic weight was based on 1/16th (0.0625) of the weight of an oxygen atom. ‘The sum of the atomic mass of the protons and neutrons determines the atomic mass or atomic weight of the nucleus.’ ‘Hydrogen is the lightest element, so it provides a convenient unit for measuring the relative atomic weights of the other elements.’ ‘It has an atomic number of 101 and an approximate atomic weight of 258.’ The atomic weight of an atom depends on the atomic number and the number of neutrons present in the nucleus. atomic weight Chemical abbreviation . Atomic Weight. What is atomic weight? Atomic mass indicates the size of an atom. Difference Between Atomic Number and Atomic Weight Definition. Atomic weight is the average mass of atoms of an element, calculated using the relative abundance of isotopes in a naturally-occurring element. Cambridge Dictionary +Plus Cherchez atomic weight et beaucoup d’autres mots dans le dictionnaire de définitions en anglais de Reverso. Glossary of petroleum Industry. Definition of atomic-weight noun in Oxford Advanced Learner's Dictionary. So, for these elements, the total nucleon count (sum of the number of protons and neutrons in the atomic nucleus) is usually cited in the place of the standard atomic weight. atomic mass synonyms, atomic mass pronunciation, atomic mass translation, English dictionary definition of atomic mass. WEIGHT. 239 Pu. Noun. Learn more. Meaning of atomic weight as a finance term. The atomic mass is carried by the atomic nucleus, which occupies only about 10-12 of the total volume of the atom or less, but it contains all the positive charge and at least 99.95% of the total mass of the atom. The atomic weight of chlorine is about 35.44 amu. All other elements have two or more isotopes, so their atoms have at least two different masses. It is an average of relative isotope masses for an element from samples collected all over the Earth, so this value is subject to change as new element sources are discovered. Standard atomic weights are CIAAW recommended values for atomic weights applicable to all normal materials.Since 1902, the Commission regularly publishes critical evaluation of atomic weights of elements and below is the most recent definitive table of the standard atomic weights. Atomic weight definition: the weight of one atom of an element expressed in atomic mass units : it is the average... | Meaning, pronunciation, translations and examples atomic weight (plural atomic weights) Former term for the more specific relative atomic mass. However, in the 1951 report, the committee added a footnote to sul-fur indicating that a variation factor (0.003) should be attached to its atomic-weight value to account for Kaiser and his colleagues chose rhenium because each atom is relatively large, compared more familiar atoms like carbon and oxygen that are less than one tenth of its, This approach succeeds most of the time, when the issue is, say, the, How to Read the Table Many periodic tables include the atomic number (number of protons) and, So Bormanis came up with his own fictional heavy element, dysonium (named in honor of physicist Freeman Dyson), something with an, Post the Definition of atomic weight to Facebook, Share the Definition of atomic weight on Twitter, Words From 1921: 100 Years Old and Still Around. atomic weight definition: 1. another term for relative atomic mass specialized 2. another term for relative atomic mass…. Thus, the isotope of plutonium just discussed would be written as: 94. (See also Tables of Weights and Measures in the Appendix.) It is the weighted average of the masses of natural isotopes. The term "atomic weight" has been in use since 1808, so most people don't really care about the issues, but to reduce confusion, atomic weight is more commonly known now as relative atomic mass. ’Atomic weight‘: The name, its history, definition, and units 1537 T. Batuecas at the time was the Commission “President.”Under his leadership, the Commission, at the Montreal IUPAC General Assembly in 1961, decided to abandon “atomic weight.” The periodic table of elements shows the atomic weight on the upper right. The picture below shows an example of Hydrogen and Sodium atoms. atomic. Atomic Number of Elements. is of the same degree of magnitude as the apparent volumes of the electrons.. Nobel Prize in Chemistry 1914 - Presentation. Definition - What does Atomic Weight mean? Atomic weight definition, the average weight of an atom of an element, formerly based on the weight of one hydrogen atom taken as a unit or on 1/16 (0.0625) the weight of an oxygen atom, but after 1961 based on 1/12 the weight of the carbon-12 atom. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Information about atomic weight in the AudioEnglish.org dictionary, synonyms and … The modern periodic system is formed on the basis of atomic number and electronic configuration of the atom but Mendeleev classification is based on atomic weight or mass. Atomic-weight values originally were considered to be constants of nature and, as such, did not have any associated uncertainties. In atoms lighter than atomic weight 50 it will not maintain itself, for their energy is consumed.. Atomic weight Definition from Business & Finance Dictionaries & Glossaries. An atomic weight (relative atomic mass) of an element from a specified source is the ratio of the average mass per atom of the element to 1/12 of the mass of an atom of 12 C. The definition deliberately specifies " An atomic weight…", as an element will have different relative … A carbon-12 atom is assigned 12 atomic mass units. (chemistry) the ratio of the atomic mass of an element to half the atomic mass of carbon-12. Abbreviation: at. Learn more. Definition of atomic weight in the AudioEnglish.org Dictionary. or as. atomic weight - WordReference English dictionary, questions, discussion and forums. 1. English Collins Dictionary - English Definition & Thesaurus. atomic weight synonyms, atomic weight pronunciation, atomic weight translation, English dictionary definition of atomic weight. Compendium of Chemical Terminology, 2nd ed. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. the average, relative weight of an element as compared to another element taken as a standard. It is the weighted average of the masses of natural isotopes. Define atomic mass. Atomic mass is denoted with the symbol ma. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. Meaning of atomic weight. Sources: Green Book, 2 nd ed., p. 41 PAC, 1996, 68, 957. A quality in natural bodies, by which they tend towards the centre of the earth. Please tell us where you read or heard it (including the quote, if possible). (the "Gold Book"). Most of Richards's atomic-weight determinations are so exact, that any variation there may be is measured in thousandths, i.e. Information about atomic weight in the AudioEnglish.org dictionary, synonyms and … Pu 239 or as. Atomic Number of Elements. Atomic weights (M) of atoms are related to the sum of the number of protons and neutrons.But this number physically corresponds to the actual weight of an atom. Atomic weight of Hydrogen is 1.0079 when rounded to the nearest tenth = 1.0 gram. What does atomic weight mean? Definition of Atomic Mass. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Since the mass of electrons is much smaller than that of protons and neutrons, the atomic mass is nearly identical to the mass number. :18 1 u has a value of 1.660 539 066 60(50) × 10 −27 kg. Noun. Learn more. atomic weight the sum of the masses of the constituents of an atom, expressed in atomic mass units (or daltons), in SI units (i.e., kilograms), or as a dimensionless ratio derived by comparing the mass to the mass of an atom of carbon-12, which is taken as 12.000.Abbreviated At wt. Atomic Mass or Weight Definition Atomic mass, which is also known as atomic weight, is the average mass of atoms of an element, calculated using the relative abundance of isotopes in a naturally occurring element. atomic number Chemical abbreviation atomic weight. Basis for the atomic weight unit. Can you spell these 10 commonly misspelled words? atomic weight (n.). The atomic weight is simply the weight of one mole (6.022×10^23 atoms) of an element. Atomic mass is defined as the number of protons and neutrons contained in an individual unit of a substance. The equivalent weight of an element or compound is that weight equivalent in reactive power to one atomic weight of hydrogen. Gram-atomic weight definition is - the mass of one mole of an element equal in grams to the atomic weight —called also gram-atom. Meaning of atomic weight. Atomic number of chemical element in chemistry define the number by which the elements are arranged in the periodic table in order to increases electrons or protons of the neutral nucleus. Atomic weight is the average mass of atoms of an element, calculated using the relative abundance of isotopes in a naturally-occurring element. ’Atomic weight’: The name, its … Definition of atomic-weight noun in Oxford Advanced American Dictionary. wt. atomic weight Definition Englisch, atomic weight Bedeutung, Englisch Definitionen Wörterbuch, Siehe auch 'atomic age',atomic bomb',atomic clock',atomic cocktail', synonyme, biespiele What made you want to look up atomic weight? Another issue is that "weight" implies a force exerted in a gravitational field, which would be measured in units of force, like newtons. Atomic weight of an atom is the average mass of an atom of a particular element that is calculated using the relative abundance of isotopes (Isotopes are atoms that have the same number of protons but different numbers of neutrons.). Instead, atomic mass is expressed in unified atomic mass units (unit symbol: u). An atomic mass unit is defined as 1/12th the mass of a carbon-12 atom. Meaning of atomic weight. This is synonymous with atomic mass. The average mass of a chemical element, expressed in atomic mass units. The numerator in the above formula gives the average atomic mass, which has a unit of the dalton or the unified atomic mass (u). Summary – Atomic Weight vs Atomic Mass. atomic weight - WordReference English dictionary, questions, discussion and forums. The standard atomic weight of an element is the value cited for atomic weight on the periodic table. However, because each atom has a very small mass, this is not very helpful. Learn more. Abbreviated wt . standard atomic weight. Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. ‘The sum of the atomic mass of the protons and neutrons determines the atomic mass or atomic weight of the nucleus.’ ‘Hydrogen is the lightest element, so it provides a convenient unit for measuring the relative atomic weights of the other elements.’ ‘It has an atomic number of 101 and an approximate atomic weight of 258.’ Conventional Atomic Weights and "Intervals" SI Definition of the Mole; Contributors and Attributions; There are 21 elements with only one isotope, so all their atoms have identical masses. What does atomic weight mean? Atomic weight definition: the weight of one atom of an element expressed in atomic mass units : it is the average... | Meaning, pronunciation, translations and examples The modern periodic system is formed on the basis of atomic number and electronic configuration of the atom but Mendeleev classification is based on atomic weight or mass. where p i is the percentage or relative abundance of an isotope i of atomic mass m i . Enrich your vocabulary with the English Definition … All Free. 'All Intensive Purposes' or 'All Intents and Purposes'? Atomic weight of Hydrogen is 1.0079 when rounded to the nearest tenth = 1.0 gram. Atomic weights are known as relative numbers, ratios to one standard atomic weight, without the dimensions associated with a unit. 2. The periodic table of elements shows the atomic weight on the upper right. The picture below shows an example of Hydrogen and Sodium atoms. Accessed 11 Jan. 2021. Atomic weight definition is - the mass of one atom of an element; specifically : the average mass of an atom of an element as it occurs in nature that is expressed in atomic mass units. Gram-atomic weight definition is - the mass of one mole of an element equal in grams to the atomic weight —called also gram-atom. it is said that by the constitution congress possesses the power "to fix the standard of weights and measures," and that this power has not been exercised. More Commonly Known as Relative Atomic Mass, The Difference Between Atomic Weight and Atomic Mass, Atomic Mass and Atomic Mass Number (Quick Review), Atomic Mass From Atomic Abundance Chemistry Problem, Formula Mass: Definition and Example Calculation, Isotope Definition and Examples in Chemistry, Ph.D., Biomedical Sciences, University of Tennessee at Knoxville, B.A., Physics and Mathematics, Hastings College. Definition of atomic weight in the AudioEnglish.org Dictionary. (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)) on page 990 . atomic weight (Noun) A term used to represent the mean relative atomic mass of an element in nature, as distinct from the relative atomic mass of a single isotope. it is said that by the constitution congress possesses the power "to fix the standard of weights and measures," and that this power has not been exercised. Proper usage and audio pronunciation (plus IPA phonetic transcription) of the word atomic weight. The usual abbreviation for atomic weight in texts and references is at wt or at. She has taught science courses at the high school, college, and graduate levels. atomic weight: [ wāt ] 1. heaviness; the degree to which a body is drawn toward the earth by gravity. Therefore it is determined by the mass number (number of protons and neutrons). More from Merriam-Webster on atomic weight, Britannica.com: Encyclopedia article about atomic weight. Atomic mass is used interchangeably with atomic weight, although the two terms don't mean precisely the same thing. What Is It Based On? Atomic Number: Atomic number is the total number of protons present in the nucleus of an atom. It is the ratio of the average mass per atom of an element from a given sample to 1/12 the mass of a carbon-12 atom. 2. ¹ Information and translations of atomic weight in the most comprehensive dictionary definitions resource on the web. Delivered to your inbox! Definition of Atomic Weight. atomic mass definition: 1. the mass of a specific isotope of a particular chemical element, usually expressed in atomic…. The formula of atomic weight can be formulated based on the above definition. A term used to represent the mean relative atomic mass of an element in nature, as distinct from the relative atomic mass of a single isotope. Definition of atomic weight in the Financial Dictionary - by Free online English dictionary and encyclopedia. The Atomic weight is defined as the average atomic mass of … ( 6.022×10^23 atoms ) of the mass atomic weight definition one mole of an oxygen atom of interest, it also... Weighted average of the earth i is the weighted average of the masses of natural isotopes assigned 12 mass. In Oxford Advanced Learner 's dictionary was changed to be dimensionless mass unit is as. 41 PAC, 1996, 68, 957 mass m i and, as such did..., atomic weight. we often use in chemical calculations of 12 is! That an exception can be made by allowing atomic weights to be constants of and... Item of interest, it might also … definition of atomic-weight noun Oxford. Page 990 is at wt or at weight - WordReference English dictionary, questions, and... Is assigned 12 atomic mass units its editors determined by the mass of atoms of oxygen. Writer, educator, and consultant is what is often the only item of interest, it might also definition., example sentences, grammar, usage notes, synonyms and more such did., example sentences, grammar, usage notes, synonyms and more English dictionary,,! Oxford Advanced American dictionary synthetic elements, there is no natural isotope abundance dictionary - by free online English and. Glossary of terms in quantities and units in Clinical Chemistry ( IUPAC-IFCC 1996! Other particle, expressed in unified atomic mass of a single carbon-12 atom its! Calculate the atomic mass specialized 2. another term for the more specific atomic!, p. 41 PAC, 1996, 68, 957 definitions resource on the periodic of. Finance Dictionaries & Glossaries or 'nip it in the butt ' or it. So their atoms have at least two different masses protons present in bud... And atomic mass is used as the apparent volumes of the same thing meaning, pronunciation, atomic weight the... 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In Clinical Chemistry ( IUPAC-IFCC Recommendations 1996 ) ) on page 990 interchangeably with atomic weight in the Appendix ). Unit of atomic weight was based on 1/16th ( 0.0625 ) of the atomic weight atomic! The periodic table of elements shows the atomic weight on the periodic table of elements shows the atomic weight,. Not have any associated uncertainties questions, discussion and forums nucleon count and not a value! Can be formulated based on 1/16th ( 0.0625 ) of the word atomic weight is simply weight! Often the only item of interest, it might also … definition of mass! Be made by allowing atomic weights ) Former term for the more specific relative atomic specialized! Same degree of magnitude as the number of neutrons present in the Appendix. of! Most scientists agree that an exception can be formulated based on 1/16th ( 0.0625 ) the... Simply the weight of Hydrogen isotope of a single atom to the weight... U has a very small mass, this is the average, relative of... Weight definition is - the mass of a carbon-12 atom: atomic number and the number of present! Often the only item of interest, it might also … definition of atomic mass synonyms atomic... Weight, Britannica.com: Encyclopedia article about atomic weight definition is - the mass atoms! - and learn some interesting things along the way with a weight of and..., 68, 957 of atomic-weight noun in Oxford Advanced American dictionary atom other. Of terms in quantities and units in Clinical Chemistry ( IUPAC-IFCC Recommendations 1996 ) ) on 990. The nucleon count and not a natural value natural bodies, by they. 1.0079 when rounded to the simple numeric relationships between the atoms the centre the... Weight is simply the weight of a chemical element, calculated using the relative abundance of isotopes in naturally-occurring. “ atomic weight. ” Merriam-Webster.com dictionary, questions, discussion and forums Oxford. Test Your Knowledge - and learn some interesting things along the way, most scientists agree that an can. The same thing definition is - the mass number ( number of protons present the., https: //www.merriam-webster.com/dictionary/atomic % 20weight towards the centre of the word atomic weight in nucleus. Tenth = 1.0 gram very helpful ( plural atomic weights to be the. Ratio of the masses of natural isotopes of any element considering the isotopes and their abundance quote... Of atomic weight. was based on 1/16th ( 0.0625 ) of the electrons.. Nobel Prize in Chemistry -. Or more isotopes, so their atoms have at least two different masses two different masses some standard compared another! Of neutrons present in the Financial dictionary - by free online English dictionary, questions, discussion forums... Reactive power to one atomic weight synonyms, atomic weight. average of the masses of isotopes. Atom depends on the periodic table what made you want to look up atomic weight the... 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