The table gives the melting points of the Period 3 elements from sodium to aluminium. Na: $371\,\text{K}$, Mg: $923\,\text{K}$, Al: $932\,\text{K}$ Which factor accounts for the rise in melting points from sodium to aluminium?
- Athe changes in first ionisation energy from sodium to aluminium
- Bthe increase in electronegativity from sodium to aluminium
- Cthe increase in the $A_r$ of the elements from sodium to aluminium
- Dthe increase in the number of outer electrons in each atom from sodium to aluminium