matter
anything that takes
up space and has
mass
atoms
smallest particle
of matter
electron
negative charge surrounds the
nucleus
proton
positive charge
- in the nucleus
neutron
no charge - in
the nucleus
atomic
number
equal to the number
of protons (also
electrons)
atomic mass
equal to protons +
neutrons (the
nucleus)
neutral atom
# of protons and
electrons are equal
(no charge)
element
pure substance
consisting of one
atom
isotope
atoms of the same
element with different
# of neutrons
chemical
compound
substance of two or
more elements in
definite proportions
chemical
formula
shows what elements
and how many are in
a compound (H2O)
chemical
bonds
hold elements
together
coalent bond
sharing of
electrons
ionic bond
transferring of
electrons
ion
a charged atom (gain
or lost an electron)
positive
charged ion
has lost an
electron
negatively
charged ion
has gained an
electron