Reading the
Periodic Table
What does Atomic Mass
tell us?
QUESTION…
How could you find the number of
neutrons???
Answer:
Atomic mass (rounded)
Atomic #
# of neutrons
Lets give it a Try!
How many protons,
electrons, and
neutrons does Ne
have?
10
+
p
10
e
10
0
n
Let’s Practice…
Find the number of p+, e-, and n for each
element:
1. H
1 p+
1 e0n
2. He
3. Tb
2 p+
2 e2n
65 p+
65 e94 n
Class Work…
Find the number of p+, e-, and n for each element:
1. Si
2. Hg
3. Fe
4. Ta
5. Pt
• Protons (+): Atomic Number
• Neutrons: Atomic Mass minus
Protons
• Electrons (-): Same number as
Protons
• Protons (+): Atomic Number
• Neutrons: Atomic Mass minus
Protons
• Electrons (-): Same number as
Protons
• Protons (+): Atomic Number
• Neutrons: Atomic Mass minus
Protons
• Electrons (-): Same number as
Protons
Atomic Particles
Particle
Proton
Neutron
Electron
Location
Mass in
amu
Charge
AtomicWhat
Particles
is amu????
• amu is short for atomic mass unit
Particle
•
Proton
Neutron
Electron
Location
Mass in
amu
Charge
Atomic Particles
Particle
Location
Mass in
amu
Proton
Nucleus
1
+1
Neutron
Nucleus
1
0
Electron
Cloud
0
-1
Charge
Atomic Inventory
Element
Helium
Symbol
Atomic
Number
He
2
4
12
Magnesium Mg
Mass
Number
Protons
Neutrons
Electrons
2
2
2
24
12
12
12
Iron
Fe
26
56
26
30
26
Argon
Ar
18
40
18
22
18
Atomic Inventory
Element
Symbol
Atomic
Number
Mass
Number
Zinc
Zn
30
65
Bromine
Br
35
Aluminum
Al
Uranium
U
Protons
Neutrons
Electrons
30
35
30
80
35
45
35
13
27
13
14
13
92
238
92
146
92
Atomic Inventory
Element
Symbol
Atomic
Number
Mass
Number
Sodium
Na
11
23
Krypton
Kr
36
Calcium
Ca
Silver
Ag
Protons
Neutrons
Electrons
11
12
11
84
36
48
36
20
40
20
20
20
47
108
47
61
47
1. Where is the atomic number on
an element block
On the bottom
On the top
On the right
On the bottom but
you have to round
it
70%
20%
10%
...
ht
tto
m
O
n
O
th
e
n
bo
th
e
th
e
O
n
bo
th
e
n
r ig
to
p
tto
m
0%
O
A.
B.
C.
D.
2. What do you need to do to the atomic
mass before you subtract the number of
protons to get the number of neutrons?
A. Add the number
90%
of electrons
B. Round
C. Nothing
10%
A
dd
th
e
ot
hi
ng
N
nd
ou
R
nu
m
be
r..
.
0%
3. What is an element symbol?
A. An abbreviation of
an element name
B. Something below
the atomic mass
C. Something that
determines the
sequence of the
periodic table
80%
15%
th
e
ng
m
et
hi
So
So
m
et
hi
ng
th
be
at
d
lo
w
of
a
ia
tio
n
br
ev
ab
n
A
et
er
...
...
n.
..
5%
4. True or False: You are able to tell how
many protons and electrons an atom has
just by looking at the periodic table.
A. True
95%
B. False
ls
e
Fa
Tr
ue
5%
5. How many protons does
Phosphorus have?
90%
15
P
Phosphorus
30.97
10%
46
0%
15
0%
16
31
16
15
46
31
A.
B.
C.
D.
6. How many neutrons does
Phosphorus have?
50%
15
P
25%
20%
45
5%
15
Phosphorus
30.97
16
31
16
15
45
31
A.
B.
C.
D.
7. Where is the element symbol
located?
15
95%
P
Phosphorus
30.97
C
0%
0%
D
5%
B
A
B
C
D
A
A.
B.
C.
D.
8. What part of an atom are protons
located?
A. Nucleus
B. Electron cloud
C. Atomic rings
75%
15%
rin
to
m
ic
A
El
ec
t
N
ro
n
uc
cl
ou
le
u
s
d
gs
10%
9. What is the charge of a neutron?
A. +
B. C. 0
75%
20%
0
-
+
5%
10. Where is an electron located on
an atom?
A. Nucleus
B. Electron cloud
C. Atomic rings
90%
5%
rin
to
m
ic
A
El
ec
t
N
ro
n
uc
cl
ou
le
u
s
d
gs
5%
11. What is the mass (in amu) of
both protons and neutrons?
A. Depends on the
atom
B. 1
C. 0
45%
30%
D
ep
en
ds
on
th
e.
0
1
..
25%
12. Complete the following atomic
Inventory:
Element Symbol
Atomic
#
Atomic
Mass
Protons
Titanium
22
48
22
Electrons Neutrons
100%
A. Ti, 22, 26
B. Ta, 28, 20
C. Ti, 20, 28
28
0%
Ti
,2
0,
20
8,
,2
Ta
Ti
,2
2,
26
0%
13. Complete the following atomic
Inventory:
Element Symbol
Atomic
#
Co
Atomic
Mass
Protons
Electrons Neutrons
27
27
32
95%
A. Calcium 27, 58
B. Cobalt, 27, 58
C. Cobalt, 27, 59
al
t,
ob
C
C
ob
al
t,
27
,5
27
,5
8
8
,5
27
um
al
ci
C
9
5%
0%
14. Where is an neutron located?
A. Electron cloud
B. Atomic center
C. nucleus
80%
15%
s
cl
eu
nu
ce
to
m
ic
A
El
ec
t
ro
n
cl
ou
d
nt
er
5%
15. What is the mass (amu) of an
electron?
40%
35%
-1
1
25%
0
A. 0
B. +1
C. -1
16. Which of the following is NOT
matter:
Stool
Book
Air
light
100%
ht
lig
ir
k
oo
B
0%
A
0%
l
0%
St
oo
A.
B.
C.
D.
17. True or False: Atoms can be
broken down into smaller substances.
A. True
B. False
55%
ls
e
Fa
Tr
ue
45%
18. Protons, electrons, and
neutrons are called ______ of an
atom.
Molecules
Sunshine
locations
Subatomic
particles
74%
26%
pa
rt
..
to
m
ic
ca
tio
ns
.
0%
Su
ba
lo
ns
Su
ol
ec
ul
e
hi
ne
s
0%
M
A.
B.
C.
D.
19. Matter is…
5% 0%
ca
n
ty
th
a
th
a
A
ny
th
in
g
th
in
g
ny
A
ou
es
tt
ak
as
th
th
a
th
in
g
ny
A
..
m
a.
.
..
ca
.
ou
ty
th
a
..
0%
th
in
g
C.
D.
95%
ny
B.
Anything that you can hear
and see
Anything that has mass and
takes up space
Anything that takes up space
Anything that you can’t see
A
A.
20. What are you made up of?
Fat
McDonalds
Compounds
Atoms
90%
to
m
s
un
d
om
po
C
cD
on
M
s
al
ds
t
5%
0%
A
5%
Fa
A.
B.
C.
D.