9x9= someone talk to me until 3?:)
dont be younger than 16 thankss!

9x9= 81

use the hands trick for multiples of nine

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