Chemistry Chap 3
amu
abbreviation for atomic mass unit
atomic mass (element)
average relative mass of the isotopes of an element in amu
nucleus
central part of an atom where protons and neutrons are located
atomic model
model that shows the structure of an atom and the arrangement of subatomic particles in an atom
electron cloud
outer part of an atom where electrons are located
isotopic abundance
percent of an isotope of an element in nature
atomic mass (atom)
relative mass of an atom in amu
atomic mass unit
unit of relative mass equal to 1/12 the mass of a carbon- 12 atom
isotopic notation
notation that shows the chemical symbol, atomic number, and mass number for an isotope of an element
atomic number
number of protons in an atom
subatomic particles
one of three basic particles that make up an atom
neutron
subatomic particle that is electrically neutral
mass number
sum of the number of protons and neutrons in an atom
nucleon
term for a subatomic particles in the nucleus of an atom
Atomic Theory
theory that says that substances are composed of atoms and chemical reactions involve interactions of atoms
atom
smallest particle of an element that can enter into a chemical reaction
electron
subatomic particle that has a negative
proton
subatomic particle that has a positive charge
isotope
variety of atom of an element that has a distinctive number of neutrons