____________________
are
the
smallest
particles
of
an
____________________
that
still
have
the
element
?
s
properties
.
They
are
the
building
blocks
of
all
____________________
.
Individual
atoms
are
extremely
small
.
At
the
center
of
an
atom
is
the
____________________
.
The
nucleus
,
in
turn
,
consists
of
two
types
of
particles
,
called
____________________
and
____________________
.
These
particles
are
tightly
packed
inside
the
nucleus
.
Constantly
moving
about
the
nucleus
are
other
particles
called
electrons
.
A
____________________
is
a
particle
in
the
nucleus
of
an
atom
that
has
a
____________________
electric
charge
.
All
protons
are
identical
.
It
is
the
number
of
protons
that
gives
atoms
of
different
elements
their
unique
properties
.
A
____________________
is
a
particle
in
the
nucleus
of
an
atom
that
has
____________________
electric
charge
.
Atoms
of
an
element
often
have
the
same
number
of
neutrons
as
protons
.
An
electron
is
a
particle
____________________
the
nucleus
of
an
atom
that
has
a
____________________
electric
charge
.
The
charge
of
an
electron
is
opposite
but
equal
to
the
charge
of
a
proton
.
Atoms
have
the
____________________
number
of
electrons
as
protons
Adapted
from
CK12
.
or
g
