Question

which order about ionisation enthalpy is correct​

Answer 1

Explanation:

All are isoelectronic species but as number of protons i.e. atomic number increases, the attraction between electron ( to be removed ) and nucleus increases and thus ionisation enthalpies increase. Order of A:Te2-(52)<l-(53)<Cs+(55)<Ba2+(56)

Answer 2

Explanation:

The correct order of ionization energy of C,N,O & F is C<O<N<F.

In a period on moving from left to right, the ionization energy increases. This is due to increase in the effective nuclear charge.

However the ionization energy of O is lower than the ionization energy of N. This is because in case of N an electron is to be removed from stable half filled 2p sub-shell which requires large energy.

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