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As atomic number increases from 57 to 71...

As atomic number increases from 57 to 71 in tripositive lanthanon, the number of unpaired electrons

A

increases regularly from 0 to 14

B

first increases from 0 to 7 and then fall to zero

C

increases from 0 to 5 and then fall to zero

D

increase from 0 to 6 and then fall all zero

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The correct Answer is:
B
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