| A | B |
|---|
| atoms | Matter is composed of tiny particles called: |
| nucleus | The center of the atom. |
| electrons | Tiny particles that swarm around the nucleus |
| electron cloud | Fast moving electrons form: |
| neutrons | The nucleus of an atom is made up of protons and _____ |
| protons | The nucleus of an atom is made up of nutrons and _____ |
| positive | Protons have this type of a charge. |
| negative | Electrons have this type of a charge. |
| hydrogen | The simplest atom having one protron and one electron. |
| helium | An atom containing two protons and two electrons. |
| carbon | atom with 6 protrons and 6 electrons. |
| oxygen | An atom with 8 protrons and 8 electrons. |
| shell | The orbit of two or more electrons the same distance from the nucleus. |
| sodium | Atom with 11 protrons and electrons and 3 shell orbits. |
| atomic number | The number of protons in an atom. |
