The correct order of electron gain enthalpy with negative sign of F, Cl, Br, and I, having atomic number 9,17,35 and 53 respectively, is

Question

The correct order of electron gain enthalpy with negative sign of F, Cl, Br, and I, having atomic number 9,17,35 and 53 respectively, is (A)  F>Cl>Br>I  (B)  Cl>F>Br>I  (C)  Br>Cl>I>F  (D)  I>Br>Cl>F

Tardigrade Admin · Accepted Answer

The electron affinity of F is less than Cl due to small size of 2p orbital of F atom than 3 p orbital of Cl atom. The negative value of electron gain enthalpy is the highest. Cl > F > Br > I

Q. The correct order of electron gain enthalpy with negative sign of $F, Cl, B r$ , and $I$ , having atomic number $9, 17, 35$ and $53$ respectively, is

$F > Cl > B r > I$

$Cl > F > B r > I$

$B r > Cl > I > F$

$I > B r > Cl > F$

The electron affinity of $F$ is less than $Cl$ due to small size of $2 p$ orbital of $F$ atom than $3 p$ orbital of $Cl$ atom. The negative value of electron gain enthalpy is the highest.
$Cl > F > B r > I$

Q. The correct order of electron gain enthalpy with negative sign of F,Cl,Br, and I, having atomic number 9,17,35 and 53 respectively, is

F>Cl>Br>I

Cl>F>Br>I

Br>Cl>I>F

I>Br>Cl>F