Miller and Levine Biology 2.1 vocab

ionic bond

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

compound

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

molecule

The smallest unit of most compounds

nucleus

The protons and neutrons at the center of an atom

electron

negatively charged particle with only 1/1840 the mass of a proton. Remain outside the nucleus in the electron cloud

atom

basic unit of matter

isotopes

one of the several forms of a single element, which contains the same number of protons but different number of neutrons

element

A pure substance that consist entirely of one type of atom. More than 100 elements are known

covalent bond

type of bond between atoms in which electrons are shared

ion

atom that has a positive or negative charge due to loosing or gaining an electron

Van Der Waals Forces

intermolecular forces of attraction that are named after the scientist who discovered them