# Question #15ca4

Apr 11, 2017

Look at what each atom is bound to, as well as its position in the periodic table.

#### Explanation:

The simplest example would be NaCl.

When NaCl dissolves, it dissociates into the ions of $N {a}^{+}$ and $C {l}^{-}$.

How do I know that?
Well:
NaCl is the representation of the ionic compound. Given that there is no indication of a net charge on the compound, I know that the charge on the Na has to cancel out the charge on the Cl (because otherwise, the compound would have a net charge).

Now I look at the position of each atom to determine what its ion would be. In chemistry, every atom seeks a full octette; i.e. Cl has to gain one electron, whilst Na has to lose one. In an ionic compound exactly that happens. Sodium's electron is taken by Chlorine, hence, giving Chlorine a negative charge (as it has one more electron than it has protons) and Sodium a positive charge.

1. Look at the charge on the compound (an example of a non-neutral compound would be $H S {O}_{4}^{-}$)