Question

I really need help on this

Answer 1

Reacting Substances

To determine what would occur when two substances react, we must identify their charges.

There is what's called the criss-cross method where we put the substances with their charges side by side, and criss-cross their charges to get the number of atoms there are for each substance.

Solving the Question

We're given:

• Mg reacts with Cl.

Mg has a charge of +2 and Cl has a charge of -1:

⇒ $Mg^{+2}\hspace{10} Cl^{-1}$

Criss-cross the charges:

⇒ $MgCl_2$

Therefore, for every 1 atom of magnesium, there would be 2 atoms of chlorine.

Answer

For every 1 atom of magnesium, there would be 2 atoms of chlorine.