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  4. For magnitude of electron gain enthalpy of chalcogens and halogens, which of the following options is correct?

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Q. For magnitude of electron gain enthalpy of chalcogens and halogens, which of the following options is correct?

Classification of Elements and Periodicity in Properties

Solution:

Order of $\Delta H_{eg}$ for halogens: $Cl>\,F>\,Br>\,I$ and Order of $\Delta_{eg}$ for chalcogens: $S>\,Se>\,Te>\,Po>\,O$
$Cl$ and $F$ have the highest and the second highest values in the modem periodic table