(a)[3]
A nitride ion may be represented as $^{15}_{7}\text{N}^{3-}$. Complete Table 4.1 to give the number of particles in this nitride ion.
(b)[1]
State why the magnesium ion has the formula $\text{Mg}^{2+}$ instead of $\text{Mg}^+$ or $\text{Mg}^{3+}$.
(c)[1]
The nitride ion has the formula $\text{N}^{3-}$.\n\nDeduce the formula for magnesium nitride.
(d)[2]
Magnesium nitrate, $\text{Mg(NO}_3)_2$, is an ionic compound.\n\nPredict two physical properties that magnesium nitrate would have.
(e)[2]
Calculate the percentage by mass of nitrogen in magnesium nitrate.\n\nGive the answer to two significant figures.