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Chapter 9

mass

A measure of the amount of matter in an object.

weight

A measure of how gravity pulls on an object.

metal

Any of a group of elements that conducts heat and electricity, has a shiny luster, and is flexible.

nucleus

The center of an atom that has most of its mass.

proton

A particle in the nucleus of an atom that carries one unit of positive electric charge.

neutron

A particle in the nucleus of an atom that has no electric charge.

electron

A particle in the space outside the nucleus of an atom that carries one unit of negative electric charge.

molecule

A particle that contains more than one atom joined together.

ductility

The ability to be pulled into thin wires without breaking.

corrosion

The gradual wearing away of a metal by combining with nonmetals in its environment.

volume

A measure of how much space the matter of an object takes up.

semiconductor

A material that has properties in between conductors and insulators.

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