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This problem is a little misleading, as it compares apples and oranges (Or atoms to molecules as it were). It is meaningless to talk about the combustibility of hydrogen (H) as an atom. Since combustion is a chemical reaction, it is a molecule of Hydrogen (H2) which we can say is combustible.
However, with a molecule, its atoms play only a part of determining wether or not it is combustible. A big part is also played by the bonds between the molecules atoms. As such, we can have two very reactive substances (hydrogen and oxygen gases) combine to form a very stable substance - water. |
