in what field does argon belong? 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. Anonymous. When we write the configuration we'll put all 18 electrons in orbitals around the nucleus of the Argon atom. Argon (Ar) atom Bohr model video using the Periodic Table to determine the number of Protons, neutrons, the Atomic Mass, Atomic Number, number . anon110827 September 13, 2010 N = 22. there are 22 neutrons. How many protons neutrons and electrons does argon have? 5 years ago. Potassium (K) Calcium (Ca) Nitrogen (N) Neon (Ne) Tags: Question 25 . :) … anon252703 22 hours ago . Tags: Question 24 . It is a nonmetal and a gas at room temperature. Argon was discovered by Sir William Ramsay in 1894. In writing the electron configuration for Argon the first two electrons will go in the 1s orbital. An atom of argon has 18 protons and 22 neutrons. On the periodic table, argon's atomic number is 18. 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 anon112516 September 20, 2010 . Your welcome! Argon has 22 neutrons in its nucleus, and the atomic weight of argon is 39.948 atomic mass units. SURVEY . (Isotopes of an element have varying numbers of neutrons in the nucleus.) 1 1. the mass is made up of both protons and neutrons... therefore 40 - 18 = # neutrons. 4. 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. Answer (1 of 4): 18 protons, 18 electrons, and 22 protons. argon has a molar mass of 40 and 18 prontons. anon138682 January 2, 2011 . answer choices . What element has 20 protons? (Use your periodic table.) It is a noble gas and belongs to period 3 and group 18 of the periodic table. How many electrons does it have? Argon has an atomic number of 18 and and Atomic mass of 40. This tells you that it has 18 protons. Therefore, argon has no electric charge (as with other elements). What common compounds does Argon form? 40. 18. 900 seconds . answer choices . If an element has 83 protons, what is its atomic number and which element is it? 18 protons, 18 electrons, 40-18=22 neutrons. Atomic number 83 and its identity is Bismuth. 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). Q. 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