What does avogadro’s number represent?

Avogadro's number represents the number of units in a single mole of any substance (also referred to as the "molecular weight" of the substance). Keep in mind that the units may be electrons, atoms, ions, or molecules, depending on the substance and its reaction. Avogadro's number is 6.022140857 × 10^{23} [/tex].

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