Question

How many electrons, protons, and neutrons in ^40 CA ^+2

Please show the answer step by step or show the reason for the number you choose! Thanks

Answer 1

Ans: The atomic number of Calcium ( Ca ) is 20

Atomic Number = Number of Electrons = Number of Protons = 20.

. Now,  electronic configuration of Ca and Ca²⁺ is:

Ca : 1s² 2s² 2p⁶ 3s² 3p⁶ 4s².

Ca²⁺ : 1s² 2s² 2p⁶ 3s² 3p⁶

^{Here, Ca2+ ion has 2 electron less.}

^{So, Number of electrons , e = 20 - 2 = 18}

^{Number of protons , p = Atomic Number = 20 .}

^{Number of Neutrons , n = Mass Number - Atomic Number = 40 - 20 = 20.}