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How many protons, electrons, and neutrons does 40Ar have?

User Johnjohn
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Argon in the atmosphere has three isotopes, all with 18 protons – but one type (called 36Ar) has 18 neutrons and a relative mass of approximately 36 ; a second type (called 38Ar) has 20 neutrons and a relative mass of approximately 38, and the final and most common type (called 40Ar) one has 22 neutrons
User Jonas Grumann
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18 electrons, 18 protons, and 22 neutrons 
User Robin Webb
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