Below are data on the first four ionization energies for a fictitious element X.

Question

Below are data on the first four ionization energies for a fictitious element X.
First ionization energy = 500 kJ/mol
Second ionization energy = 2000 kJ/mol
Third ionization energy = 3500 kJ/mol
Fourth ionization energy = 25000 kJ/mol

From the data, which of the following statements is incorrect?
A)X could belong to Group IIIA.
B)The fourth ionization energy is much greater than the third ionization energy because X3+ consists of a noble-gas core or a pseudo-noble-gas core.
C) The third ionization energy is greater than the second ionization energy because X2+ has a bigger charge than X+.
D)X could belong to Group IIIB.
E) X could belong to group VA

Explanation / Answer

C) The third ionization energy is greater than the second ionization energy because X2+ has a bigger charge than X+.

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