Question

4
The number of core electrons present in Calcium is
a) 8
b) 18
c) 10
d) 12​

Answer 1

The number of core electrons present in Calcium is 18

Answer 2

Answer:

18

Alternatively, calcium is a 2A metal, so it contains two valence electrons. Core = The argon core, [Ar], is composed of the core electrons in calcium. Argon contains 18 electrons, so calcium contains 18 core electrons.