Which of the following has the largest i...

Which of the following has the largest ionisation energy.

A

`._(11)Na`

B

`._(19)K`

C

`._(12) Mg`

D

`._(37)Rb`.

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The correct Answer is:

C

Among Rb,K and Na the `IE_(1)` decreases as RbltKltNa. but `IE_(1)` of NaltMg.

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