The table gives the melting points of the Period 3 elements sodium to aluminium: element: Na, Mg, Al; melting point/K: 371, 923, 932. Which factor accounts for the rise in melting points from sodium to aluminium?
- Athe change 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