Chapter 3 Vocabulary

Terms	Definitions
Atom	the smallest component of an element having the chemical properties of the element.
Atomic Mass	the mass of an isotope of an element.
Atomic Number	the order of an element in Mendeleyev's table of the elements.
Compound	a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight.
Electron	an elementary particle with negative charge.
Element	an artifact that is one of the individual parts of which a composite entity is made up.
Isotope	one of two or more atoms with the same atomic number but with different numbers of neutrons.
Law Of Conservation Of Matter	a fundamental principle of classical physics that matter cannot be created or destroyed in an isolated system.
Mass Number	the sum of the number of neutrons and protons in an atomic nucleus.
Matter	that which has mass and occupies space.
Metal	a mixture containing two or more metallic elements or metallic and nonmetallic elements usually fused together or dissolving into each other when molten.
Metalloid	of or being a nonmetallic element that has some of the properties of metal.
Mixture	a substance consisting of two or more substances mixed together.
Neutron	an elementary particle with 0 charge and mass about equal to a proton.
Nonmetal	a chemical element lacking typical metallic properties.
Nucleus	the positively charged dense center of an atom.
Proton	a stable particle with positive charge equal to the negative charge of an electron.
Substance	that which has mass and occupies space.

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