Studied by 3 people
atom
the smallest particle of an element
atomic mass
the average mass of all the isotopes of a element
atomic mass unit
a unit used to express atomic weight and is equal to 1/12 the mass of a carbon - 12 atom
atomic number
the number of protons in the nucleus of an atom
electron
a particle of matter with a negative charge
element
pure substances that cannot be broken down or decomposed into simpler substances by chemical means
isotope
forms of an element that the same protons but differing neutrons
mass number
the total number of protons and neutrons in the nucleus of an atom
neutron
particle that has no charge in the nucleus of an atom
nucleus
dense; positively charged central core of an atom
orbital
region in an atom in which an electrons are located
proton
particle with a positive charge
valence electrons
electrons on the outer level of an atom
wave - mechanical model
the current model of the atoms that deals with the wave - particle duality of nature
