VOCABULARY 6

ELEMENT: a basic building block of matter; a pure substance that cannot be broken down into anything simple.

COMPOUND: a chemical combination of two or more elements into a single substance.

ATOM: the smallest unit of an element that still has the properties of the element.

PROTON: a particle with a positive charge in the nucleus of an atom.

NEUTRON: an uncharged particle in the nucleus of an atom.

ELECTRON: a particle with a negative charge moving around the nucleus of an atom.

NUCLEUS: the dense center part of an atom.

MOLECULE: a group of more than one atom joined together that acts like a single particle.