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Atom

basic unit of matter

Nucleus

the center of the atom which contains the protons and neutrons; holds DNA

Electron

negatively charged particle; located outside the atomic nucleus

Element

substance consisting entirely of one type of atom

Isotope

atom of an element that has a number of neutrons different from that of other atoms of the same element

Compound

substance formed by the chemical combination of two or more elements in definite proportions

Ionic Bond

bond formed when one or more electrons are transferred from one atom to another

Ion

atom that has a positive or negative charge

Covalent Bond

bond formed by the sharing of electrons between atoms

Molecule

smallest unit of most compounds

Van der Vaals Forces

a slight attraction that develops between the oppositely charged regions of nearby molecules

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