Question

Electron affinity of sulphur is

• A. more than $O$ and $Se$
• B. more than $O$ but less than $Se$
• C. less than $O$ but more than $Se$
• D. equal to $O$ and $Se$

Answer 1

Answer: (A)

The values of electron affinity decrease down the group-16. But electron affinity of oxygen is unexpectedly lower because of small size of oxygen.

Electron $\,\,$Sulphur $>$ Selenium $>$ Tellurium $>$ Polonium $>$ Oxygen

affinity: $\,\,\,-208.8 \,\,\,\,\,\,\,\,\,-195.5 \,\,\,\,\,\,-190.0 \,\,\,\,\,\,\,\,\,-174 \,\,\,\,\,\,\,\,\,\,-141.4$

$( kJ / mol )$