A) Increases down the group
B) Decreases down the group
C) Remains unchanged
D) Variation is not regular
Correct Answer: B
Solution :
lonization energy of 1st group elements decreases down the group because in groups from top to bottom atomic size increases. Due to increase in atomic size, the nuclear attraction of outer electron is reduced. They easily removed from valence orbital. So ionization energy is reduced from top to bottom in a group.
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