Question

Why 2nd Ionisation enthalpy of Cr is higher than 1st ionisation enthalpy of Chromium​

Answer 1

Hi..

It is the energy needed to remove a second electron from each ion in 1 mole of gaseous 1+ ions to give gaseous 2+ ions.

When the first electron is removed from an element,its effective nuclear charge increases. Once,the effective nuclear charge increases,the hold of nucleus over its outermost electrons increases.  So,due to the increase in effective nuclear charge,more energy is required to remove the second electron from the element.

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Answer 2

Explanation:

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