Consider the elements oxygen, fluorine, argon, sulfur, potassium, and strontium. From this group of elements, which ones fit the descriptions below?
(a) Two elements that are metals.
(b) Four elements that are nonmetals.
(c) Three elements that are solid at room temperature.
(d) An element that is found in nature as X8.
(e) One pair of elements that may form a molecular compound.
(f) One pair of elements that may form an ionic compound with formula AX.
(g) One pair of elements that may form an ionic compound with formula AX2.
(h) One pair of elements that may form an ionic compound with formula A2X.
(i) An element that can form no compounds.
(j) Three elements that are gases at room temperature.
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