alleryMagnesium has atomic number 12. What is its valency?
A-3
B-2
C+2
D+3
Answer & Solution
Correct answer: C. +2
1. Electronic configuration of magnesium (Z = 12) is 2, 8, 2.
2. It has 2 electrons in its outermost shell, which it loses to attain stability.
3. Losing 2 electrons gives it a valency of +2.
_Source: RRB Group D CEN-02/2018 PYQ, Q.51._
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