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

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

COMEDKCOMEDK 2012Structure of Atom

Solution:

For element with Z = 15, electronic configuration is $1s^2 2s^2 2p^6 3s^2 3p^1_x 3p^1_y 3p^1_z$ Due to exactly half filled configuration of $3p$ orbital, the element will have the highest ionization energy.