| However, as a subatomic particle the electron is also a quantum-mechanical object. |
| Ionium expels an alpha particle and becomes radium, which is a bivalent element resembling barium belonging to the second group. |
| For 50 years, scientists had predicted the existence of the particle we now know as Higgs boson, which gives mass to matter. |
| This stopping power of an atom for an alpha particle is approximately proportional to the square root of its atomic weight. |
| Thus uranium in the sixth group loses an alpha particle and the product UX1 falls in the fourth group. |
| Every particle of food must be aerated in the lungs before it can be assimilated. |
