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Question

An element has an atomic number of 107. What is its electronic configuration and what will be its group number?

A

[Rn] 5f14 6d1 7s2 7p4 , group 3

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B

[Rn] 5f14 6d5 7s2 , group 7

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C

[Rn] 5f14 7s2 7p5 , group 7

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D

[Rn] 5f14 6d2 7s2 7p3 , group 15

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Solution

The correct option is B

[Rn] 5f14 6d5 7s2 , group 7


In accordance with Aufbau principle, the most stable electronic configuration is (b) and its group number is 7.

If you look at option (a), 7p electrons are filled without finishing 6d.
If you look at option (b), 7p electrons are filled without even starting to fill the 6d
Figure out option (d) on your own.


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