Answer on Inorganic Chemistry Question for sayanti mallick
In CaCl2 Ca is in ion form.
A calcium(II) ion, Ca2+, has 20 protons and 18 electrons because it has lost two (to give it the +2 charge).
p( Ca2+) = 20
e ( Ca2+) =20 - 2 = 18
n( Ca2+) = Ar ( Ca) - p( Ca2+)
n( Ca2+) = 40 - 20 = 20
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