Nitrogen is a gas, while other members of group `15` are solids. Why ?

Oxygen is a gas, but other elements of group 16 are solids at room temperature. Why?

Oxgen is a gas, but other element of group 16 th are solids at room temperature. Why?

Why are the members of group 1 called alkali metals?

Nitrogen is a gas while phosphorus is a solid-why?

Nitrogen does not form pentahalides, while other group members form. Describe the reaction based on hybridization of the central atom.

Oxygen exists as a gas, while sulphur exists as a solid Why ?

Oxygen exists as a gas, while sulphur exists as a solid Why ?

In group 13, Tl (thalium) shows +1 oxidation state while other members show +3 oxidation state, why ?