| A | B |
|---|
| Atom | the basic unit of matter and its really small. |
| Nucleus | the center of the atom. |
| Electron | negative charged particle surrounding the nucleus. |
| Element | a pure substance that consists entirely of one type of atom. |
| Isotopes | an atom of the same element that differs in the number of neutrons. |
| Atomic Number | the number of protons in an atom of an element. |
| Mass Number | the sum of the protons and neutrons in the nucleus of an atom.Isotopes are identified as there mass number. |
| Radioactive Isotopes | their nuclei is unstable and it breaks down at a constant rate. Isotopes can treat cancer, kill bacteria so food won't spoil and can help determine the ages of rocks and fossils. |
| Compound | a substance formed by the chemical combination of two or more elements in definite proportions. |
| Chemical Bonds | two different types of bonds. Ionic and Covalent Bonds. |
| Ionic Bond | formed when one or more electrons are transferred from one atom to another. |
