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Ionization energies of three hypothetical elements are given below (in kJ/mole)
$\begin{array}{llll} I II II \\ X 122 340 1890 \\ Y 99 931 1100 \\ Z 118 1220 1652 \end{array}$
Which of the following pairs represents elements could be of the same group?

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Y, Z

X, Y

X, Z

X. Y, Z

answer is A.

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Detailed Solution

The ionization energy is the quantity of energy that an isolated, gaseous atom in the ground electronic state must absorb to discharge an electron, resulting in a cation.

Thus, the correct option is A.

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