Question

an atom of argon is represented as 40/18 Ar . determine the number of protons and the number of neutrons in one atom of argon.

Answer 1

atomic mass = number of protons + number of neutrons

40 = 18 + neutrons

neutrons =40-18

neutrons = 22

Answer 2

$Ar^{40} _{18}$ means the relative atomic mass is on top and atomic no. is at the bottom.

So the protons = 18

          neutrons = ( 40-18 ) = 22

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