Q.

The atomic number of the element with highest ionization energy among the following is :

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a

Z = 76

b

Z = 14

c

Z = 13

d

Z = 15

answer is D.

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Detailed Solution

For element with Z = 15, electronic configuration is 1s22s22p63s23p3  Due to exactly half-filled configuration of 3p-orbital, the element will have the highest ionization energy.
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