Q14 of 60 Page 138

What is the similarity between elements Li, Be, B, C, N, O, F and Ne belonging to the second period?

These all elements (Li, Be, B, C, N, O) belong to the same period i.e. Period 2
One similarity between them is they have the same number of shells.


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How is the valency of an element related to its electronic configuration? Explain giving suitable example.

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Which amongst the following elements whose atomic number is given below belong to the same period?

Give reason. 17, 10, 20, 12, 19, 15.