Question

Why is the second ionisation enthalpy of ca is more than its first ionisation enthalpy?

Answer 1

Explanation:

The Calcium forms CaCl2 and after first ionization enthalpy it becomes Ca+2 and its atomic number becomes 18 which is of a noble gas , so it becomes highly stable therefore 2 ionization enthalpy is high

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Answer 2

Because after removing 1 electron, its effective nuclear charge increases and hence more energy is required to remove the second electron.

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