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science vocab21
chapter 4 section 1 13cards
| Question | Answer |
|---|---|
| group | elements in the same vertical column of the periodic table (also called a family) |
| family | elements in the same vertical column of the periodic table (also called a group) |
| chemical symbol | a one or two letter representation of an element |
| proton | a small positively charged particle in the nucleus of an atom |
| neutron | a small particle in the nucleus of the atom with no electric charge |
| nucleus | the central core of an atom containing protons and usually neutrons |
| electron | a tiny negatively charged particle that moves around the nucleus of an atom |
| atomic number | the number of protons in the nucleus of an atom |
| valence electron | one of the electrons farthest away from the nucleus of an atom; these electrons are involved in a chemical reaction. |
| atomic mass | the average mass of one atom of an element |
| periodic table | a chart of the elements showing the repeating pattern of their properties |
| period | a horizontal roe of elements in the periodic table |
| atomic mass unit (AMU) | a unit used to measure the mass of particles in atoms (a proton or neutron has a mass of 1 AMU) |
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