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science vocab21

chapter 4 section 1 13cards

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)
Created by: bbdevil