Basic unit of matter

any metal in Group 1A of the periodic table

the elements in Group 2A of the periodic table

Number of protons and neutrons

the number of protons in an atom

An abbreviation for an element or atom

the temperature at which a substance changes from a liquid to a gas

physical change

physical change

characteristics that can be observed when a substance interacts with another substance; ability to react; inability to react; usually hidden

A characteristic of a pure substance that describes its ability to change into different substances

the degree of compactness of a substance.

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

a negatively charged subatomic particle

area around the nucleus of an atom where the atom's electrons are most likely to be found

A pure substance made of only one kind of atom

chemical change

Elements in the same vertical column of the periodic table

Group 17

A mixture that is not uniform in composition; components are not evenly distributed throughout the mixture

a mixture that is uniform in composition; components are evenly distributed and not easily distinguished

easy to shape or bend

the temperature at which a substance changes from a solid to a liquid

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

Elements that have properties of both metals and nonmetals.

A subatomic particle that has no charge and that is found in the nucleus of an atom

Group 18

an element that conducts heat and electricity poorly

Count the capital letters (They have to be different, i.e. F and Fe are two different elements)

A horizontal row of elements in the periodic table

Color, Odor, Shape, Hardness, Texture, Density, Volume, Mass, Weight

a quality or condition of a substance that can be observed or measured without changing the substance's composition

A solid that forms from a solution during a chemical reaction.

A subatomic particle that has a positive charge and that is found in the nucleus of an atom

A sample of matter, either a single element or a single compound, that has definite chemical and physical properties

chemical property

The ability to dissolve in another substance

elements that form a bridge between elements on the left and right sides of the periodic table

The electrons in the outermost shell (main energy level) of an atom; these are the electrons involved in forming bonds.

the elements in Group 2A of the periodic table