NEET 2010 Chemistry question

Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements O, S, F and Cl?

(1)Cl < F < O < S
(2)O < S < F < ClCorrect
(3)F < S < O < Cl
(4)S < O < Cl < F

Answer: (2)

Solution

Electron gain enthalpy (magnitude, with negative sign) is greater for the halogens than for the chalcogens, because the halogens are nearer to a complete octet. Within each group the second-period element (, ) has a lower magnitude than the third-period element (,

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Question ID VK-090543