Which row gives the correct information about silicon, Si, magnesium, Mg, and their ions?
- ASi has a greater atomic radius than Mg. Explanation: Si has electrons in $3p$ orbitals. Mg has electrons in the $3s$ orbital only.
- BSi has a lower electrical conductivity than Mg. Explanation: Si has 4 delocalised electrons per atom. Mg only has 2 delocalised electrons per atom.
- CSi has a lower melting point than Mg. Explanation: Si has covalent bonding. Mg has metallic bonding.
- DThe radius of $\text{Si}^{4+}$ is smaller than the radius of $\text{Mg}^{2+}$. Explanation: Si has a greater nuclear charge than Mg.