Provide information regarding the oxidation numbers of elements present in the periodic table.

The highest oxidation number of a representative element is equal to the group number for the first two groups,and the group number minus $10$ for the other groups.
Oxidation number generally increases from left to right across a period in the periodic table.

$Group$	$1$	$2$	$13$	$14$	$15$	$16$	$17$
$Element$	$Na$	$Mg$	$Al$	$Si$	$P$	$S$	$Cl$
$Compound$	$NaCl$	$MgSO_4$	$AlF_3$	$SiCl_4$	$P_4O_{10}$	$SF_6$	$HClO_4$
$Highest \ oxidation \ state$	$+1$	$+2$	$+3$	$+4$	$+5$	$+6$	$+7$