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NEET2006Chemistrys Block ElementsActual

What will be the order of Ist ionisation energy ?

Options

  1. ALi Na K
  2. BK Li Na
  3. CNa Li K
  4. DLi K Na

Correct answer

A. Li Na K

Step-by-step solution

In a sub-group ionisation energy decreases from top to bottom because atomic size increases. So, the Ist IE of Li , Na and K are in the order Li Na K .

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