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Q.

 Number of unpaired electrons in the first and third excited states of Xe are x and y respectively. The ratio of x and y is          .

 

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answer is 0.5.

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Detailed Solution

 54Xe [Kr]4d105s25p6

1st exited state [Kr]4d105s25p55d1(X= 2)

2nd exited state  [Kr]4d105s25p45d2(Y=4)

xy = 24=12=0.5

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