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