How can I write the formula for aluminum chloride?

1 Answer
Jun 3, 2018

AlCl3

Explanation:

We know that aluminum has a valency of +3 because it has three valence electron which it can lose easily. Similarly, chlorine has a valency of โˆ’1 because it can gain an electron.

So in writing the formula, there is a cross of the two valencies because three chlorine atoms will have to react with one aluminium atom to gain one electron each.

[Al]3++3[Cl]โˆ’โ†’AlCl3