Why Argon has 22 neutrons?

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Solution

Argon is a example of isobars which have molecular weight 40 and 18 is its atomic weight so its neutron will be 22
Argon has numerous isotopes, of which the most abundant by far is Argon 40; that is 18 protons and 22 neutrons. (18+22=40).
So not all argon atoms have 22 neutrons, but most of them do in the natural world.

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