Sodium reacts with water more vigorously than lithium because:
It is more electronegative
It has a higher atomic weight
It is more electropositive
It is a metal
On moving down the group electropositive nature increases hence sodium is more electropositive than lithium.
State whether the following statements are true or false : (a) A sodium ion has positive charge because it has more protons than a neutral atom. (b) A chloride ion has negative charge because it has more electrons than a neutral atom.