Lithium has a melting point of $181\,^{\circ}\text{C}$, whereas sodium melts at $98\,^{\circ}\text{C}$. Which statement accounts for the fact that lithium has a higher melting point than sodium?
- ALithium has more valency electrons than sodium.
- BSodium is more reactive than lithium.
- CSodium is softer than lithium.
- DThe attraction between the positive ions and the ‘sea of electrons’ is stronger in lithium than in sodium.