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basic unit of matter


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


negatively charged particle; located outside the atomic nucleus


substance consisting entirely of one type of atom


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


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


atom that has a positive or negative charge

Covalent Bond

bond formed by the sharing of electrons between atoms


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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