physical science chapter 13

the organized study of the composition and interactions of matter

the foundation for the understanding of matter

tiny particles that compose all matter

a substance composed of a single type of atom

a substance composed of atoms of two or more elements bonded together

a substance that is composed of several pure substances that are physically mixed but not chemically united

a unique abbreviation given to each element

any of the smaller particles of matter of which atoms are composed

the dense central core of an atom made of protons and neutrons

subatomic particle that carries a positive electric charge and determines the identity of an atom

the number of protons in the nucleus of an atom

subatomic particle that is electrically neutral with no electric charge

any of a group of atoms that are the same element but have different numbers of neutrons

any of the small particles that compose protons and neutrons; protons and neutrons are made of up quarks and down quarks

subatomic particle that is found outside the nucleus and carries a negative electrical charge in strength to a protons positive charge

any of the concentric layers surrounding the nucleus in which electrons are found

True or False An atom normally has the same number of protons and electrons

an atom that has an electric charge because of losing or gaining electrons

Is a Cation negative or positive

Is a Anion negative or positive

a substance that consists of ions

total number of both protons and neutrons in the nucleus of an atom or isotope

(symbol u) a unit used to measure the masses of atoms; equal to exactly 1/12 the mass of a carbon-12 atom

True or False The mass of an atom in atomic mass units is approximately equal to the mass number