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Atoms
Chemistry
| Term | Definition |
|---|---|
| Electron | A tiny, negatively charged particle that moves around the outside of the nucleus of an atom |
| Nucleus | In cells, a large oval organelle that contains the cell's genetic material in the form of DNA |
| Proton | Small, positively charged particles that are found in the nucleus of an atom |
| Energy level | A region of an atom in which electrons of the same energy are likely to be found |
| Neutron | A small particle in the nucleus of an atom, with no electrical charge |
| Atomic Number | The number of protons in the nucleus of an atom |
| Isotope | An atom with the same number of protons and a different number of neutrons from other atoms of the same element |
| Mass number | The sum of protons and neutrons in the nucleus of an atom |
| Atomic Mass | The average mass of all the isotopes of an element |
| Chemical Symbol | A one-or two-letter representation of an element. |
| Group | Elements in the same vertical column of the periodic table; also called family |
| Periodic table | An arrangement of the elements showing the repeating pattern of their properties |
| Period | A horizontal row of elements in the periodic table. |
| Atom | The basic particle from which all elements are made; the smallest particle of an element. |
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