First slide

Modern approach of classification of elements

Question

Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species

Moderate

A

$C l < F < S < O$
B

$O < S < F < C l$
C

$S < O < C l < F$
D

$F < C l < O < S$

Solution

Halogens have very high electron affinity. It may be rated that the electron affinity of fluorine is unexpectedly low $(< Cl)$ This may perhaps be due to small size of F atom. The value of electron gain enthalpies for Cl .F, S and O are respectively 349. 333, 200 and $142 KJ / mol$ hence correct order is $C l > F > S > 0$

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