The following statements concern elements in the periodic table. Which of the following is true?

The electronic configurations of elements of Group 16 correspond to $\left(n\mathrm{s}{)}^2\right(n\mathrm{p}{)}^4$. These contain one extra electron as compared to half-filled configuration $(np{)}^3$ of elements of Group 15. This extra electron can be released with lesser ionization enthalpy so as to give stable configurations.