1.

The pair of elements having approximately equal ionisation potential is

Answer»

Al,Ga
Al,Si
Al,Mg
Al,B

Solution :In case of Ga there are `10`d - electrons in the penultimate energy SHELL which shield the nuclear charge less effectively, the outer electron is held firmly by nucleus. As a result, the IONISATION energy remains nearly the same as that of aluminium inspite of the fact that atomic size INCREASES.


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