atoms,molecules and the periodic table study guide
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17 terms
Terms | Definitions |
|---|---|
 atom | the smallest particle of an element |
| molecule | a combination of two or more atoms |
| chemical bond | the force that holds two atoms together |
| element | a substance that cannot be broken down into other substances by chemical or physical means |
| compound | a substance made of two or more elements chemically combined |
| atomic mass | the average mass of one atom of an element |
| periodic table | a chart of the elements showing the repeating pattern of there properties |
| nucleus | the central core of an atom containing protons and neutrons |
| proton | a small, positively charged particle in the center of and atom |
| neutron | a small particle in the nucleus of an atom,with no charge (neutral) |
| electron | a tiny, negatively charged particle that moves around the nucleus of an atom |
| atomic mass unit (amu) | a unit used to measure the mass of particles in atom |
| atomic number | the number of protons in the nucleus of an atom |
| chemical symbol | a one or two letter represantation of an element |
| family | elements in the same vertical column of the periodic tabel (also called group) |
| period | a horizontal row of elements in the periodic table |
| valence electron | one of the electrons farthest away from the nucleus of the atom involved in chemical reactions |
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