Which one of the following arrangements represents the correct order of electron gain enthalpy of the given atomic species?

Options

A. `OltSltFltCl`
B. `ClltFltSltO`
C. `SltOltCiltF`
D. `FltClltOltS`

Answer

A

Explanation

Electron gain enthalpy becomes more negative across a period while it becomes less negative in a group However,electron gain enthalpy of O or F is less than that of the succeding element.When electron is added to n=2,the repulsion is more than when it is added to n=3 in case of Cl or S.