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Ch 3 Vocab

Vocab from 3.1 and 3.2

The average mass of one atom of an element. atomic mass
A chart of the elements showing the repeating pattern of their properties. periodic table
The central core of an atom containing protons and usually neutrons. nucleus
A small, positively charged particle in the nucleus of the atom. proton
A small particle in the nucleus of the atom, with no electrical charge. neutron
A tiny, negatively charged particle that moves around the nucleus of an atom. electron
A unit used to measure the mass of particles in atoms; a proton or neutron has a mass of 1 amu. atomic mass unit
The number of protons in the nucleus of an atom. atomic number
A one- or two-letter representation of an element. chemical symbol
Elements in the same vertical column of the periodic table; also called family. group
Elements in the same vertical column of the periodic table; also called group. family
A horizontal row of elements in the periodic table. period
One of the electrons farthest away from the nucleus of the atom; these electrons are involved in a chemical reaction. valence electron
A term used to describe material that can be hammered and rolled into shape. malleable
A term used to describe a material that can be pulled out into a wire. ductile
A substance that can transmit heat or electricity easily. conductor
A characteristic of those metals that are attracted to magnets and can be made into magnets. magnetic
The ease and speed in which an element or compound combines with other elements and compounds. reactivity
The gradual wearing away of a metal element due to a chemical reaction. corrosion
A mixture of two or more metals. alloy
An element in Group 1 of the periodic table alkali metals
An element in Group 2 of the periodic table. alkaline earth metals
An element in Group 3 through 12 of the periodic table. transition metals
An element in the first row of the rare earth elements in the periodic table. lanthanides
An element in the second row of the rare earth elements in the periodic table actinides
An element that lacks most of the properties of metals. nonmetal
A molecule composed of two atoms that are the same. diatomic molecule
The elements in Group 17 of the periodic table. halogens
An element in Group 18 of the periodic table. noble gas
An element that has some of the characteristics of metals and some of the characteristics of nonmetals. metalloid
An element that can conduct electricity under some conditions. semiconductor
Created by: Mrs. Klein



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