The proton number of caesium is $55$. Relative to lithium, caesium has a ......1...... melting point, and its reaction with water is ......2...... vigorous. Caesium has ......3...... valence electrons than lithium. Which words correctly fill gaps 1, 2 and 3?
- Ahigher, more, the same
- Bhigher, less, the same
- Clower, more, greater
- Dlower, more, the same