Which atom would be neutral? an oxygen atom with 9 electrons, 8 protons, and 8 neutrons
an oxygen atom with 4 electrons, 6 protons, and 4 neutrons
an oxygen atom with 8 electrons, 8 protons, and 9 neutrons
an oxygen atom with 16 electrons, 18 protons, and 16 neutrons

The amount of charge on a single proton is equal to the amount of charge possessed by a single electron. A proton and an electron have an equal amount but an opposite type of charge. Thus, if an atom contains equal numbers of protons and electrons, the atom is described as being electrically neutral.

what is the volume occupied by 40 grams of argon gas (ar) at standard conditions? what volume, in liters, is occupied by 1.5 x 1023