How is a compound different from a mixture?

A compound is two or more elements chemically joined into molecules while a mixture is two or more elements mixed but not chemically joined.

If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom

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