Question

on moving from left to right in a given period the number of shells

Answer 1

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On moving from left to right in a period, the chemical reactivity of elements first decreases and then increases. On moving from left to right in a period, the number of valence electronsincreases from 1 to 8. On moving from left to right in a period, the atomic size decreases; the size of the atoms decreases.

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Answer 2

▶The number of columns, to the left or right, that you want the upper-left cell of the result to refer to. Using 5 as the cols argument specifies that the upper-left cell in the reference is five columns to the right of reference.