When a lightning flash is produced,which gas is primarily formed?

How many isotopes of nitrogen are found in nature?

Three allotropes $(A)$,$(B)$ and $(C)$ of phosphorus in the following change are respectively
$A \xrightarrow[1200 \ atm]{470 \ K} B$
$A \xrightarrow[CO_2 - atm]{570 \ K} C$

Nitrogen forms $N_2$,but phosphorus forms $P_2$,which quickly converts into $P_4$. The reason for this is:

In the nitrogen family,the $H-M-H$ bond angle in the hydrides $MH_3$ gradually becomes closer to $90^o$ on going from $N$ to $Sb$. This shows that gradually

Phosphine is obtained from the following compound: