Miller & Levine Biology, chapter 2, lesson 1

atom

the basic unit of matter

nucleus

the center of the atom which contains the protons and neutrons

electron

A subatomic particle that has a negative charge

element

pure substance that consists entirely of one type of atom

isotopes

Atoms of the same element that have different numbers of neutrons

compound

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

ionic bond

A chemical bond resulting from the attraction between oppositely charged ions.

ion

A charged atom

covalent bond

A chemical bond that involves sharing a pair of electrons between atoms in a molecule

molecule

two or more atoms held together by covalent bonds

van der Waals forces

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