Vocabulary #4

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

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 than acts like a single particle.