Ncert Exercises & Solutions

2.27 Give the number of electrons in the species $H_{2}^{+}$ , $H_{2}$ , and $O_{2}^{+}$

$H_{2}^{+}$ :
Number of electrons present in hydrogen molecule ( $H_{2}$ ) = 1 + 1 = 2
Number of electrons in $H_{2}^{+}$ = 2 – 1 = 1

$H_{2}$ :
Number of electrons in $H_{2}$ = 1 + 1 = 2

$O_{2}^{+}$ :
Number of electrons present in oxygen molecule ( $O_{2}$ ) = 8 + 8 = 16
Number of electrons in $O_{2}^{+}$ = 16 – 1 = 15