The element which has the least metallic character is ..........

What are the freezing and boiling points of ammonia $(NH_3)$?

Which of the following oxides is amphoteric in nature?

In diborane $(B_2H_6)$,the number of electrons that accounts for bonding in the bridges is

Which of the following statements about $BF_4^{-}$ and $AlF_6^{3-}$ are correct?
$(i)$ $B$ and $Al$ differ in their oxidation states.
$(ii)$ $B$ and $Al$ differ in their covalency.
$(iii)$ $B$ obeys the octet rule.
$(iv)$ $B$ and $Al$ are in diagonal relationship.

Boric acid is solid,whereas $BF_3$ is gas at room temperature because of