| A | B |
|---|
| Atom | Smallest particle of an element. (11) |
| Atoms contain: | Positive protongs, neutral neutrons, negative electrons. (11) |
| Each element | Has a unique arrangement of protons, neutrons, and electrons. (13) |
| Nucleus of an Atom is made of: | Neutrons and Protons . (12) |
| Electrons | Orbit around the nucleus. (12) |
| Atomic Number | Number of Protons. (14) |
| Atomic Mass or weight | Number of Protons plus Neutrons. (15) |
| Energy Levels | Different Orbits of electrons. (16) |
| Chemical reactions, bonding, formation of compounds | Involve Electrons. (17) |
| Atoms want: | A full outer energy level. (18) |
| Compounds | Elements combined with other elements. (19) |
| Covalent bonds | Atoms that share electrons when a molecule is formed. (20) |
