The
mass
number
of
an
atom
is
equal
to
the
____________________
number
of
____________________
and
neutrons
found
in
the
____________________
of
a
____________________
atom
.
The
mass
number
of
a
particular
atom
is
____________________
the
same
as
the
average
____________________
____________________
of
an
element
.
The
mass
number
is
____________________
found
on
the
Periodic
Table
.
In
order
to
determine
the
mass
number
of
a
particular
atom
,
you
need
to
____________________
the
number
of
protons
and
neutrons
together
and
since
you
can't
have
a
____________________
of
a
proton
or
neutron
,
the
sum
will
always
be
a
____________________
number
.
The
number
on
the
____________________
of
each
box
on
the
Periodic
Table
is
known
as
the
____________________
atomic
mass
.
This
is
an
____________________
for
all
of
the
atoms
of
a
particular
element
.
If
you
need
to
determine
the
mass
number
of
a
particular
atom
,
do
NOT
look
on
the
Periodic
Table
for
this
number
,
since
it
is
____________________
found
there
.
Simply
____________________
the
number
of
protons
and
neutrons
in
a
particular
atom
____________________
.
The
____________________
____________________
is
a
quick
way
of
representing
the
name
or
symbol
of
the
element
followed
by
the
____________________
____________________
.
Adding
or
removing
____________________
from
the
electron
cloud
does
____________________
affect
mass
of
an
atom
since
they
are
too
____________________
to
make
a
significant
____________________
to
the
____________________
mass
of
the
atom
.
