Question

1. The number of electrons in an ion M2+ will be (Atomic number=20)
a. 22
b.20
c.18
d. None of these
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Answer 1

Answer:

option c 18 is answer

Explanation:

because the the element donate 2 electron from its outermost shell to obtain the stable electronic configuration of its nearest noble gas

Answer 2

The number of electrons in ion M2+ will be c. 18.

M2+ ion is the cation as is represented by the positve sign. Cations are the positively charged ions lacking electrons with respect to protons.

Since the M2+ ion has charge of +2, hence, there will be decrease in two electrons from 20 electrons. Hence, number of electrons in M2+ will be 18.

Anions are negatively charged ions that have excess electrons. They are denoted by negative sign.