help please?

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which of these is a molecule
Na Ca Mg H2O

2006-12-10 12:03:49 · 2 answers · asked by Eva 1 in Education & Reference ➔ Homework Help

2 answers

H2O, the others are elements. A molecule being two or more atoms in a definitive arrangement, such as H2O. H2O containing Hydrogen and Oxygen atoms in a ratio of 2:1.

2006-12-10 12:14:18 · answer #1 · answered by bjstanfordau 2 · 0⤊ 0⤋

None of them are molecules. Na,Ca Mg are element symbols from a periodic table, the last one is the molecular symbol for water(2 molecules of Hydrogen,1 molecule of oxygen).

2006-12-10 12:16:03 · answer #2 · answered by david b 4 · 0⤊ 0⤋