Anything that has mass and volume

The amount of matter in a substance

The amount of space the substance occupies

The basic building blocks of most of the matter around you

One of the basic substances that combine to form all other substances

Matter that has the same chemical composition throughout and cannot be separated into its parts by physical means

The smallest particle of an element that has all the properties of that element

The center of the atom

The nucleus of most atoms is made up of these two kinds of particles

These carry a positive (+) charge of an atom

These carry a negative (-) charge of an atom

These have no charge of an atom

Subatomic particles that exist in an area outside the nucleus

The number of protons in the nucleus of an atom

An atom is equal to the total mass of protons

The code, normally composed of one or two letters, used to represent an element on The Periodic Table. For example, H (Hydrogen)

The number of these determine the identity of an element

Sodium is an element found in table salt. It contains 11 protons, 12 neutrons. How many electrons are found in a neutral atom of sodium?

Elements are described as pure substances because

The nucleus of an atom contains