Which statement accounts for calcium having a higher melting point than barium?
- ACalcium cations are smaller than barium cations and have a stronger attraction to the delocalised electrons.
- BThe structure of calcium is partly giant molecular.
- CThere are more delocalised electrons in calcium than in barium as it has a lower ionisation energy.
- DThere is greater repulsion between barium atoms as they have more complete electron shells than calcium atoms.