The correct order of electron gain enthalpy with negative sing F, Cl,

1.	The correct order of electron gain enthalpy with negative sing F, Cl, Br and I, having atomic number 9, 17, 35 and 53 respectively, is :–(a) I > Br > Cl > F (b) F > Cl > Br > I(c) Cl > F > Br > I (d) Br > Cl > I > F
Answer» Correct option (c) Cl > F > Br > I Explanation: As we go down the group in Periodic Table, atomic size increases, force of attraction for the added electron decreases, hence electron gain enthalpy decreases. X(g)+e^- → X^-(g) Actual order is Cl > F > Br > I The fact that fluorine has a less electron gain enthalpy than chlorine seems to be due to the relatively greater effectiveness of 2p-electron in the small F-atom to repel the additional electron entering the atom than do 3p-electrons in the larger Cl-atom.

The correct order of electron gain enthalpy with negative sing F, Cl, Br and I, having atomic number 9, 17, 35 and 53 respectively, is :–(a) I > Br > Cl > F (b) F > Cl > Br > I(c) Cl > F > Br > I (d) Br > Cl > I > F

Answer»

Correct option (c) Cl > F > Br > I

Explanation:

As we go down the group in Periodic Table, atomic size increases, force of attraction for the added electron decreases, hence electron gain enthalpy decreases.

X(g)+e^- → X^-(g)

Actual order is Cl > F > Br > I

The fact that fluorine has a less electron gain enthalpy than chlorine seems to be due to the relatively greater effectiveness of 2p-electron in the small F-atom to repel the additional electron entering the atom than do 3p-electrons in the larger Cl-atom.

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