The experimentally determined `N-F` bond length in `NF_(3)` is _____than the sum of the single covalent bond radii of `N` and `F` .

(a) PF_5 is known, but NF_5 is not. Why ? (b) The experimentally determined N-F bond length in NF_3 is greater than the sum of single convalent radii of N and F .

(a) PF_5 is known, but NF_5 is not. Why ? (b) The experimentally determined N-F bond length in NF_3 is greater than the sum of single convalent radii of N and F .

Account for the following : (i)The experimentally determined N-F bond length in NF_3 is greater than the sum of the single bond covalent radii of N and F . (ii) Mg_3 N_2 when reacted with water gives NH_3 but HCl is not obtained from MgCl_2 on reaction with water at room temperature. (iii) (SiH_3)_3 N is a weaker base than (CH_3)_3 N .

The experimentally determined N-F bond length in NF_(3) is greater than the sum of the covalent raddi of N and F. Assign reason.

Number of single covalent bonds in ammonia are