Chemistry

If an element has the atomic number 20, what sublevels are present?

It has a p sublevel.

The first energy level has an s; the second energy level has an s and a p; the third energy level has an s, p, and d; the fourth energy level has an s.

It has an s sublevel.

The first energy level has an s; the second and third energy levels have an s and a p; the fourth energy level has an s.

B?

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  1. look up CALCIUM's electron structure

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