Valency

What is Valency? 

State Octet rule.

In the given compounds: ${\mathrm{CaH}}_2, \mathrm{NaH}, {\mathrm{SiH}}_4, {\mathrm{AlH}}_3$. The valencies of $\mathrm{Ca}, \mathrm{Na}, \mathrm{Si}, \mathrm{Al}$ are:

Give one or two word(s) for the following:

Combining capacity of an element.

Define the following terms.

Valency 

The combining capacity of an element is called its atomicity.

What is the valency of sodium in $\mathrm{NaCl}$ and calcium in $\mathrm{CaO}$?

The valency of the Magnesium atom is _____.

The valency of the phosphorous atom is 3 and _____.

Elements with valency 1 are either metals or_____.

An atom have 3 protons and 4 neutrons will have valency of

The valency of sulphide ion is _____.

The Valency of  Ammonium ion is _____.

The valency of iodide ion is _____.

The Valency of Hydroxide ion is _____.

The common valency of lead is 1 and_____.

The most stable valency of Lead is _____.

The valency of fluoride ion is _____.

The valency of fluoride ion is _____ .

The common valency of copper ion is 1 and_____.