An
atom
is
composed
of
____________________
subatomic
particles
.
They
are
the
protons
,
neutrons
,
and
electrons
.
The
____________________
are
positive
,
the
____________________
are
neutral
(
IE
.
they
have
no
charge
)
,
&
the
____________________
are
negative
.
The
center
of
the
atom
is
called
the
____________________
and
it
contains
the
protons
and
neutrons
,
while
the
____________________
are
in
"
orbits
"
around
the
nucleus
.
The
Atomic
Number
of
an
element
is
always
the
____________________
of
protons
in
the
nucleus
.
Because
protons
are
positive
,
in
a
____________________
atom
the
number
of
negative
electrons
will
also
equal
the
atomic
number
.
While
the
electrons
have
almost
NO
MASS
,
the
protons
and
neutrons
each
weigh
1
AMU
(
Atomic
Mass
Unit
)
and
their
combined
____________________
add
up
to
the
Mass
Number
.
Differing
numbers
of
neutrons
in
the
same
element
make
atoms
called
____________________
.
They
are
the
same
element
with
____________________
mass
numbers
.
As
mentioned
before
,
neutral
atoms
of
an
element
will
have
the
same
number
of
____________________
protons
and
____________________
electrons
.
If
an
atom
____________________
electrons
,
it's
overall
charge
will
decrease
by
the
number
of
electrons
it
gains
,
IE
.
-
1
,
-
2
,
etc
.
If
an
atom
____________________
electrons
,
it's
overall
charge
will
increase
by
the
number
of
electrons
it
loses
,
IE
.
+
1
,
+
2
,
etc
.
These
charged
particles
are
called
____________________
and
we
will
learn
more
about
them
later
in
Unit
4
(
Chemical
Bonding
.
)
