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Q.

Which of the following statements is correct?

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a

Ionization energies of elements decrease along the period.

b

Ionization energies of the II A group element are less than that of the corresponding III A group elements.

c

Ionization energies of group 15 elements are less than that of the corresponding group 16 elements.

d

The ionization energy of Ga is greater than Al.

answer is D.

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Detailed Solution

 Gallium's electronic configuration contains 10 electrons in a 3d subshell which is not able to provide shielding to the outermost electrons from the nucleus. As a result, Ga's effective nuclear charge rises. So,  Gallium has higher ionization energy than aluminum.

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