111. An atom becomes an ion if it loses or gains electrons. The ion charge is (sum of proton charges) + (sum of electron charges). Complete the table.
| Name of Ion | Proton Charge | Electron Charge | Ion Charge |
|---|---|---|---|
| Hydroxide ion | +9 | — | −1 |
| Sodium ion | +11 | — | +1 |
| Aluminium ion | +13 | −10 | — |
| Oxide ion | +8 | −10 | — |
| Name of Ion | Proton Charge | Electron Charge | Ion Charge |
|---|---|---|---|
| Hydroxide ion | +9 | −10 | −1 |
| Sodium ion | +11 | −10 | +1 |
| Aluminium ion | +13 | −10 | +3 |
| Oxide ion | +8 | −10 | −2 |
Ion charge = (proton total) + (electron total).
Hydroxide: 9 + (−10) = −1; Sodium: 11 + (−10) = +1; Aluminium: 13 + (−10) = +3; Oxide: 8 + (−10) = −2.