Test: Ionic Compounds - Grade 10 MCQ

Metals form ions by losing electrons to form positive ions. If an atom gains electrons the atoms formed are negative.

A negative ion has more electrons than protons. If an ion has more protons than electrons, its charge is positive.

The charge on the ions of all group 7 elements, including bromine, is -1. If an ion has a charge of -2, the element must be in group 6.

The electronic structure of a magnesium atom is 2.8.2. The atom loses two electrons to form a magnesium ion, so the electronic structure of the ion is 2.8.

There are 15 calcium ions for every 30 chloride ions, so there is 1 calcium ion for every 2 chloride ions. This means that the formula of calcium chloride is CaCl₂.

An ionic compound has a high melting point and it conducts electricity when liquid. It also has a high boiling point, but it does not conduct electricity when solid.

An advantage of a two-dimensional space-filling model is that it shows the arrangement of ions in one layer.

The formula of a sulfide ion is S^2-.