The trend for ionization enthalpies with increasing atomic number is very simila

Question

The trend for ionization enthalpies with increasing atomic number is very similar to the trend of estimated effective nuclear charge,but there are some differences Give two examples where these trends differ and explain why the trends do not correlate in those cases The trend for ionization enthalpies with increasing atomic number is very similar to the trend of estimated effective nuclear charge, but there are some differences Give two examples where these trends differ and explain why the trends do not correlate in those cases.

Explanation / Answer

Ionization enthalpy is amount of energy supplied when a neutral atom looses an electron. As the effective nuclear charge increases down the group say from (a) Ca to Sr or from (b) Ga to In, due to increasing atomic number, additional valence shells are also added. Therefore the shielding of valence shell electron decreases down the group. Therefore lesser energy is needed to pull of valence electrons. Therefore, the ionization energy decreases as we go from (a) Ca to Sr or from (b) Ga to In.

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