Which element has the same number of energy levels as aluminum (al) and the same number of valence electrons as calcium (ca)? a. beryllium b. sodium c. potassium d. magnesium

The correct answer is Magnesium (Mg)

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be

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