Unit 2~Part A Vocabulary

The basic unit of Matter. An ____ cannot be broken down by a chemical change.

A positively charged particle found in the nucleus of an atom.

A particle with no charge but the mass of a proton.

A negatively charged particle found outside the nucleus in a region called the electron cloud.

The center of an atom containing the protons and neutrons.

The Region surrounding the nucleus of an atom where electrons are found.

The number of protons and neutrons found in the nucleus of an atom.

The number of protons in the nucleus.

A type of matter with only one type of atom. Each element has it's own kind of atom where the number of protons defines the element.

The unit of measure used to measure the mass of an atom.

Atoms of the same element with the same number of protons, but different number of neutrons.

An atom of an element that undergoes nuclear changes in which particles break apart and energy leave the nucleus of the atom.

The outermost energy level or shell in an atom.

Subatomic particles found within the protons and neutrons of an atom.

A positively or negatively charged atom having the number of protons not equal to the number ofelectrons.