Atomic Structure

Structure of an atom.

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  • Created on: 06-06-11 21:46
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Atomic Structure:
I nsi
de t
he atom:
T h ere ar
e 3
types of
part
icl
e i
nsi
d e
the at
om: pr
otons,
n eutr ons
and
el
e ctr
o ns.
T h e prot
o n s and
n eut
rons ar
e found squashe d
toget
he r i
n t he
midd le
of
t
h e atom.
T h e middl e i
s cal
led t
he nucl
eu s
and i
s i
ncre d i
bly
sma l
l
and
dense.
T h e t
iny
e lect
rons whizz
around t
he
nucleus.
T he prot
o n has a charge of
+1 and
a ma ss
of
1
atomi c ma ss
u ni
t.
T he neut r
on has a charge of
0
a nd
a ma ss
of
1 atomi c mass u ni
t.
T he el
e ctr
o n
has a
cha r
ge of
1
a nd
a negli
gibl
e ma s s of
0
ato mic mass un i
ts.
I n
the
p eriodi
c t
a bl
e ,
each el
eme nt
has 2 numbe r
s:
A T OMIC NU MB E R:
A moun t
of
prot
ons (amou nt
of
e l
e ct
ron s )
.
T h i
s i
s t
he
s ma l
ler
n umb er
.
MA SS
N U MB ER :
Amo un t
of
prot
ons + amou nt
of
n e ut
rons.
Th is
is
the bi
gg er
n umb er.
A T OMIC NU MB E R +
n umbe r
of
neutr
on s MA SS N U MBE R

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