Chapter 05 vocab.txt

A group of 2 or more atoms that function as a unit because the atoms are tightly bound together

A molecule that contains two atoms

A molecule that contains three atoms

A molecule in which all of the atoms present are the same kind. By definition, a homoatomic molecule must be an element

A molecule in which two or more different kinds of atoms are present. By definition a heteroatomic molecule must be a compound

Compounds that have heteroatomic molecules as their basic structural unit

Atoms are not collected together into discrete heteroatomic molecules

A compound that contains ions (most compounds that contain metal)

The number of protons in the nucleus of an atom

The sum of the number of protons and the number of neutrons in the nucleus of an atom

A pure substance in which all atoms present have the same comic number, that is, all atoms have the same number of protons

Atoms of an element that have the same number of protons and electrons but have different numbers of neutrons. Isotopes will always have the same atomic number but different mass numbers

The percent of atoms in a naturally occurring sample of a pure elements that are a particular isotope of that element

An element that only has one naturally occurring form or isotope

Atoms of different elements that have the same mass number. Isobars will have the same mass number but different atomic numbers

A weighted average mass that takes into account the existence of isotopes and their relative abundances