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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) |