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. Atomic number is the number of protons. (Use your periodic table.) :) … It is a noble gas and belongs to period 3 and group 18 of the periodic table. 22. SURVEY . argon has a molar mass of 40 and 18 prontons. Argon has 22 neutrons in its nucleus, and the atomic weight of argon is 39.948 atomic mass units. Potassium (K) Calcium (Ca) Nitrogen (N) Neon (Ne) Tags: Question 25 . 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. N = 22. there are 22 neutrons. 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 was discovered by Sir William Ramsay in 1894. Answer (1 of 4): 18 protons, 18 electrons, and 22 protons. 1 1. How many protons, neutrons and electrons does Argon have? The number of protons is what defines the element. 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. answer choices . In writing the electron configuration for Argon the first two electrons will go in the 1s orbital. 18 + N = 40. How many protons neutrons and electrons does argon have? (Isotopes of an element have varying numbers of neutrons in the nucleus.) 18. How many electrons does it have? Argon (Ar) atom Bohr model video using the Periodic Table to determine the number of Protons, neutrons, the Atomic Mass, Atomic Number, number . answer choices . There are 22 neutrons in one atom of argon. 900 seconds . Because its outer electron shell is full, it is chemically unreactive. Q. This tells you that it has 18 protons. anon110827 September 13, 2010 What element has 20 protons? - 3377908 When we write the configuration we'll put all 18 electrons in orbitals around the nucleus of the Argon atom. anon252703 22 hours ago . Atomic number 83 and its identity is Bismuth. anon138682 January 2, 2011 . anon112516 September 20, 2010 . in what field does argon belong? Argon has an atomic number of 18 and and Atomic mass of 40. Tags: Question 24 . What common compounds does Argon form? Your welcome! If an element has 83 protons, what is its atomic number and which element is it? 4. Therefore, argon has no electric charge (as with other elements). Anonymous. 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