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Into to Chemistry/3/
Chapter 3, Lesson 1 - 2
| Term | Definition |
|---|---|
| Atom | The smallest particle of an element that has the properties of that element. |
| Electron | A tiny, negatively charged particle that moves around the outside of the nucleus of an atom. |
| Nucleus | The central core of an atom which contains protons and neutrons. |
| 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 the 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. |
| Periodic table | An arrangement of the elements showing the repeating pattern of their properties. |
| Chemical symbol | A one- or two-letter representation of an element. |
| Period | A horizontal row of elements in the periodic table. |
| Group | Elements in the same vertical column of the periodic table; also called family. |
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