Tags: Question 24 . (Use your periodic table.) Q. The number of protons is what defines the element. How many protons, neutrons and electrons does Argon have? - 3377908 Atomic number is the number of protons. argon has a molar mass of 40 and 18 prontons. This means that some Argon atoms have 18 neutrons, some 20 neutrons and some 22 neutrons the isotope with 22 neutrons is the most common and forms 99.6% of all Argon. anon138682 January 2, 2011 . answer choices . Anonymous. Please answer me asap! Argon has 22 neutrons in its nucleus, and the atomic weight of argon is 39.948 atomic mass units. There are 22 neutrons in one atom of argon. The protons and electrons cancel each other out because protons produce a positive charge, electrons a negative charge, and they have the same amount. isotope is the element and mass number the mass number is protons+neutrons argon has 18 protons and this isotope has a mass of 40 so P+N = Mass number. 18 + N = 40. How many protons neutrons and electrons does argon have? the mass is made up of both protons and neutrons... therefore 40 - 18 = # neutrons. In writing the electron configuration for Argon the first two electrons will go in the 1s orbital. Your welcome! Argon was discovered by Sir William Ramsay in 1894. What element has 20 protons? This tells you that it has 18 protons. Potassium (K) Calcium (Ca) Nitrogen (N) Neon (Ne) Tags: Question 25 . 18. Answer (1 of 4): 18 protons, 18 electrons, and 22 protons. When we write the configuration we'll put all 18 electrons in orbitals around the nucleus of the Argon atom. How many neutrons and electrons does argon have? 1 1. 5 years ago. in what field does argon belong? Therefore, argon has no electric charge (as with other elements). N = 22. there are 22 neutrons. Argon has an atomic number of 18 and and Atomic mass of 40. is argon used in light bulbs? anon112516 September 20, 2010 . Name: Argon Symbol: Ar Atomic Number: 18 Atomic Mass: 39.948 amu Melting Point:-189.3 °C (83.85 K, -308.74 °F) Boiling Point:-186.0 °C (87.15 K, -302.8 °F) Number of Protons/Electrons: 18 Number of Neutrons: 22 Classification: Noble Gas Crystal Structure: Cubic Density @ 293 K: 1.784 g/cm 3 Color: Colorless Gas Atomic Structure anon110827 September 13, 2010 How many electrons does it have? argon has 22 neutrons It is a noble gas and belongs to period 3 and group 18 of the periodic table. An atom of argon has 18 protons and 22 neutrons. In order to write the Argon electron configuration we first need to know the number of electrons for the Ar atom (there are 18 electrons). SURVEY . If an element has 83 protons, what is its atomic number and which element is it? Atomic number 83 and its identity is Bismuth. anon252703 22 hours ago . On the periodic table, argon's atomic number is 18. 22. 40. answer choices . Because its outer electron shell is full, it is chemically unreactive. 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