The first two ionisation enthalpies of Lanthanoids are comparable to calcium Ca . Explain how.

The lanthenoids show the following configuration :-

Ln – 4f 1-14  5 s2   5s6   6s2

And configuration of Calcium is :-

Ca- [Ar] 4s2

In both of the cases there are 2 electrons in outer s-subshell.

Thus ionisation enthalpies of lanthenoids are comparable to the Calcium.

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