Which one are only mixtures? a. Air, steel, soft drink b. Iron(Fe), Sulfur (S), phosphorus (P) c. Magnesium oxide(MgO), iron(II) chloride (FCl₂), Salt (NaCl) d. Steel, milk, Chlorine gas (Cl₂)

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.

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