Complete the sentence. a substance can be classified as a(n) or a(n)

Copunds or a(n) element

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

It will appear as o2(g) as a reactant