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Which of the following has the lowest fi...

Which of the following has the lowest first ionization thalpy?

A

Ca

B

Sr

C

Ba

D

Ra

Text Solution

Verified by Experts

The correct Answer is:
C
Down the group, ionization enthalpy decreases on account of increase of size. However, Ra has slightly higher first ionization enthalpy relative to Ba on ccount of the presence of poor sheilding 4 f electrons. The same is true for its 2nd ionization enthalpy.
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