The element phosphorus is located to the right of the element magnesium along the same period in the periodic table.Which best describes the relationship of the elements?

Phosphorus has an atomic mass of about 31, while magnesium’s is about 24.3, so phosphorus has the larger atomic mass. Moving to the right across a period increases atomic number, so magnesium does not have the larger atomic number. Magnesium and phosphorus also belong to different categories and have different chemical properties.

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