Question

Which of the given halogens has has highest electron affinity f cl br i

Answer 1

Cl has the highest electron affinity

Answer 2

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Solution:

Chlorine has highest electron affinity.

The order of electron affinity are

Cl> F>Br>I

Electron affinity decrease down the group

Knowledge booster:

# Electron affinity of fluorine is less than chlorine due to small size of fluorine atom and strong inter- electronic repulsion in the small 2p orbital of fluorine decrease attraction of incoming electron with nucleus

# Electron affinity is the amount of energy released, when an electron is added to neutral atom which result in negative ion

# Electron affinity is inversely proportional to atomic size. As atomic size increases it means there is decrease in nuclear charge and decrease in electron affinity

# Electron affinity increase across the period and decrease down the group

# The reason for increase in electron affinity across the period is there is increase in nuclear charge in period which decrease atomic size and it become difficult to remove electrons and more energy is required to remove electrons so electron affinity increases across period