Which of the following gives the correct decreasing order of electron gain enthalpy (with negative sign) for fluorine, chlorine, bromine and iodine, whose atomic numbers are 9, 17, 35 and 53 respectively?

Question

Accepted Answer

Cl > F > Br > I. Chlorine has the highest electron gain enthalpy due to its optimal size and effective nuclear charge, making it easier to gain an electron. Fluorine, while highly electronegative, experiences greater electron-electron repulsion in its small atomic radius, resulting in a slightly lower electron gain enthalpy than chlorine. Bromine and iodine have larger atomic sizes, leading to a decrease in their ability to attract additional electrons, thus placing them lower in the order.

Which of the following gives the correct decreasing order of electron gain enthalpy (with negative sign) for fluorine, chlorine, bromine and iodine, whose atomic numbers are 9, 17, 35 and 53 respectively?

Solution

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