Question

element in the first period have valence electron in___cell​

Answer 1

Answer:

I don't find the question correct.

But I found some thing related-

The row, or period, number that an element resides in on the table is equal to the number of total shells that contain electrons in the atom. H and He in the first period normally have electrons in only the first shell; Li, Be, B, and other period -two elements have two shells occupied, and so on.

Answer 2

Explanation:

period 1 element need 2 electrons to complete their balanced shell

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