What element behaves most like magnesium
between si, s, sr, sn

I think the correct answer from the choices listed above is option D. The element that behaves most like magnesium would be strontium. It behaves most like magnesium because it is in the same family, the alkaline earth metals. Hope this answers the question.

In any atom of any element, you will find protons and neutrons in the nucleus of any atom