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Arrange the following in order of decreasing ionisation energy: Br, Ar, Ar+, and Cl. Put charges...

Arrange the following in order of decreasing ionisation energy: Br, Ar, Ar+, and Cl. Put charges in parentheses.

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Answer #1

Answer : Ar+ > Ar > Cl > Br

Explanation: Ar is a noble gas and it has completely filled valence shell, hence they are very stable so removing electron requires very large energy. So ionisation of noble gase is highest in respective period.

If an atom has positive charge then removing electron is even more difficult because of increased force of attraction from the nucleus. Hence Ar+ has highest ionisation energy,

In a group, down the group ionisation energy decreases so Cl has higher ionisation energy than Br.

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