An atoms is made up of 3 smaller kinds of particles called subatomic particles. Ther are NEUTRON, PROTON, ELECTRON.
Atom is mainly made out of empty space, the necleus house the neutron and proton while the electron is housed by the membrane.
O2-> 2 oxygen atoms in one molecule.
Electron Proton Neutron
Table that summarizes the characteristics of each subatomic particle Outside the nucleus -1 Almost 0 Electron In the nucleus 0 1 Neutron In the nucleus +1 1 Proton Location Relative Electric Charge Relative Mass Particle