Hydrogen can be found in many things. It cannot be broken down to create something else. An example of something like hydrogen is oxygen. We call things like hydrogen or oxygen _ .

matter im pretty sure sorry if its wrong

Explanation:

based on the property of conserving matter, matter can not be created or destroyed

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

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