Question

The melting point of lithium (181°C) is just double the melting point of sodium (98°C) because –
(a) down the group, the hydration energy decreases
(b) down the group, the ionization energy decreases
(c) down the group the cohesive energy decreases
(d) None of these

Answer 1

answer is (c) ...down the grp size increases therby metallic bond become weak.     cohesive energy decreases