Which of the following are the valencies of $X$ if it is an element forming the following compounds  $H_{2}X$, $C{X}_2$, $X{O}_2$, $X{O}_3$ with hydrogen, carbon, and oxygen respectively?

$H_{2}X$, $C{X}_2$, $X{O}_2$, $X{O}_3$ respectively.
Valency of X in $H_{2}X$ = $-2$
Valency of X in $C{X}_2$= $-2$
Valency of X in $X{O}_2$ = $+4$
Valency of X in $X{O}_3$ = $+6$
The valencies of X are $-2$, $+4$ and $+6$ when it forms compounds with hydrogen, carbon, and oxygen.