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40 Cards in this Set

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  • Back
matter
Anything that has mass and occupies space.
Element
A substance that cannot be broken down into any other substances by chemical or physical means.
Compound
A substance made up of two or more elements chemically combined in a specific ratio, or proportion.
Mixture
Two or more substances that are mixed together but not chemically combined.
Atom
The smallest particle of an element.
Scientific Theory
A well-tested idea that explains and connects a wide range of observations.
Model
Physical, mental, visual, and other representations of an idea to help people understand a concept that they cannot observe directly.
Electrons
Negatively charged particles that move around outside the nucleus of an atom.
Nucleus
The central core of the atom, containing protons and usually neutrons.
Protons
Small, positively charged particles that are found in the nucleus or an atom.
Energy Level
A region of an atom in which electrons of the same energy are likely to be found.
Neutrons
Small, uncharged particles that are found in the nucleus of an atom.
Valence Electrons
The electrons that are in the highest energy level of an atom and that are involved in chemical reactions.
Electron Dot Diagrams
A representation of the valence electrons in an atom, using dots.
Chemical Bond
The force that holds atoms together.
Symbol
A one or two letter set of characters that is used to identify an element.
Atomic Number
The number of protons in the nucleus of an atom.
Period
Elements in the same horizontal row of the periodic table.
Group
Elements in the same vertical column of the periodic table; also called a family.
Noble gases
An element of Group 18 of the periodic table (non reactive)
Halogen
An element belonging to Group 17 of the periodic table.
Alkali Metal
An element belonging to Group 1 of the periodic table.
Ion
An atom or group of atoms that has become electrically charged.
Polyatomic Ion
An ion that is made of more than one atom.
Ionic Bond
The attraction between oppositely charged ions.
Ionic Compound
A compound that consists of positive and negative ions.
Chemical Formula
A combination of symbols that represents the elements in a compound.
Subscript
A number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound.
Crystal
An orderly, three-dimensional pattern of ions or atoms in a solid.
Covalent Bond
A chemical bond formed when two atoms share electons.
Molecule
A neutral particle made of two or more atoms joined by covalent bonds.
Double Bond
A chemical bond formed when atoms share two pairs of electrons.
Triple Bond
A chemical bond formed when atoms share three pairs of electrons.
Molecular compound
A compound that is composed of molecules.
Polar Bond
A covalent bond in which electrons are shared unequally.
Nonpolar Bond
A covalent bond in which electrons are shared equally.
Metallic Bond
An attraction between a positive metal ion and the electrons surrounding it.
Alloy
A material made of two or more elements that has the properties of a metal.
Ductile
A term used to describe a material that can be pulled out into a long wire.
Malleable
A term used to describe material that can be hammered or rolled into shape.