Question

Ca (Valency 2) & O (Valency 2)

Answer 1

Answer:

The valency of calcium is 2+.Calcium

has 2 electrons in its outermost shell ,its electronic configuration being (2,8,8,2). In order to attain stability it loses 2 electrons to become stable according to the octet rule. By losing electrons it gains a positive charge hence the valency of Calcium is 2+.

Oxygen has 6 VALANCE (outer shell) electrons. To complete a stable octet it requires a further two. Oxygen has a valency of -2 (minus 2) because it can acquire 2 elections. The valency of oxygen is -2. This means oxygen needs to gain or share two electrons for stability.

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Answer 2

$\huge \tt \color{seagreen} \: \: \: \: ANSWER \:$

The valency of calcium is

$\tt \: 2 +$

And the valency of oxygen is

$\tt \: - 2$