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the central core of an atom containing protons and usually neutrons


a small positively charged particle in the nucleus of the atom


a small particle in the nucleus of the atom with no electrical charge


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


an atom with same number of protons and a different number of neutrons from other atoms

mass number

the sum of protons and neutrons in the nucleus of an atom


object that helps explain ideas about the natural world

atomic mass

the average mass of all the isotopes of an element

periodic table

a chart of the elements showing the repeating pattern of their properties

chemical symbol

a one or two letter representation of an element


a horizontal row of elements in the periodic table


elements in the same vertical column of the periodic table also called a family


a class of elements characterized by physical properties that include shininess, malleability, ductility,and conductivity


a term used to describe material that can be pounded into shapes


a term used to describe a material that can be pulled out into a long wire


the ability of an object to transfer heat or electricity to another object


the ease and speed with an element combines, or reacts, with other elements and compounds


the gradual wearing away of a metal element due to a chemical reaction

alkali metal

an element in group 1 of the periodic table

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