# What is the formula of calcium chloride?

Feb 13, 2018

See below...

#### Explanation:

Calcium chloride is an ionic compound.

$\therefore$ it is made of ions. As we know, ions can i have $+$ or $-$ charge but the key idea is that the overall charge of an ionic compound has to balance out to be neutral.

Calcium is in group 2 $\therefore$ it has a 2+ charge.
Chlorine is in group 7 $\therefore$ it has a -1 charge.

As the overall charge is 0 (neutral) the charges must balance. Therefore we need two chlorine ions to balance out the calcium ion charge as $2 - 2 = 0$

$\therefore$ have $C a C {l}_{2}$

Note that the 2 is supposed to be little and under the chlorine symbol, i just don't know how to edit it.