Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure. The chemical symbol for Hydrogen is H.. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table. Carbon: Value given for graphite form. Nitrogen: Density given for N at 0° Celsius. This is approximately the sum of the number of protons and neutrons in the nucleus. Isotopes This isotope of carbon has 6 protons and 6 neutrons. Relative atomic mass The mass of an atom relative to that of carbon-12. 2 Oxygen: Density given for O at 0° Celsius. The acidic character of oxides of group 13 elements decreases down the group and the basic character increases. The melting points of these elements are quite low, which is 180° Celsius in the case of Lithium, while it is 39° Celsius in the case of Rubidium. 2 Fluorine: Density given for F at 0° Celsius. Where more than one isotope exists, the value given is the abundance weighted average. Isotope: Atoms of the same element with the same atomic number, but different number of neutrons. This is because they have smaller sizes, and hence small volumes. Alkali metal, any of the six elements of Group 1 (Ia) of the periodic table—lithium, sodium, potassium, rubidium, cesium, and francium. Notes on the Density of particular elements: Hydrogen: Density given for H at 0° Celsius. The density increases from B to Tl. You will find separate sections below covering the trends in atomic radius, first ionisation energy, electronegativity, melting and boiling points, and density. The densities of the Group 1 elements increase down the group (except for a downward fluctuation at potassium). Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure.The chemical symbol for Hydrogen is H. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table. Density is mass divided by volume, so this causes the density to. The reason may be that as you go down a group, the atomic structure increases. Lithium, rubidium and caesium are much less abundant. 2 Generally, the densities of all of the elements increase as you go down the group. Trends in Density. Acid-Base Characteristics. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. Density (g cm −3) Density is the mass of a substance that would fill 1 cm 3 at room temperature. Francium is radioactive and only has short lived isotopes formed from the decay of other elements. Thus, each proton and neutron has a mass of about 1 amu. So as you go down the group 7A and element in the halogen family would have the same volume, the atomic mass increases. Density of diamond form is 3500. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. The alkali metals are so called because reaction with water forms alkalies (i.e., strong bases capable of neutralizing acids). The higher it is the more dense the substance is. 2 Helium: Density at 0° Celsius. Density, or volumic mass, is a measure of mass per unit of volume, - either kilograms per cubic meter or grams per cubic centimeter. Density. This trend is shown in the figure below: The metals in this series are relatively light— lithium, sodium, and potassium are less dense than water (less than 1 g cm-3). This page explores the trends in some atomic and physical properties of the Group 1 elements - lithium, sodium, potassium, rubidium and caesium. Sodium and potassium are the most abundant Group 1 elements on the Earth, and can be found in rock salt deposits formed from salt water evaporation. 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