Los Alamos National Laboratory's Chemistry Division Presents:
Periodic Table of the Elements
A Resource for Elementary, Middle School, and High School Students

Chemistry in a Nutshell How to Use the Periodic Table Alphabetical List of the Elements Naming New Elements Mendeleev's Original Table About This Page Go to LANL's Chemistry Division Site! Los Alamos National Laboratory Home Page What is the Periodic Table?

Period Group**
       
 
1
IA
1A
18
V
IIIA
8A
1 1
H
1.008
2
IIA
2A
13
IIIA
3A
14
IVA
4A
15
VA
5A
16
VIA
6A
17
VIIA
7A
2
He
4.003
 
2 3
Li
6.941
4
Be
9.012
5
B 10.81
6
C
12.01
7
N 14.01
8
O 16.00
9
F 19.00
10
Ne
20.18
 
3 11
Na
22.99
12
Mg 24.31
3
IIIB
3B
4
IVB
4B
5
VB
5B
6
VIB
6B

7
VIIB
7B

8 9 10 11
IB
1B
12
IIB
2B
13
Al
26.98
14
Si
28.09
15
P
30.97
16
S
32.07
17
Cl 35.45
18
Ar
39.95
 

------- VIII -------
------- 8 -------

4 19
K
39.10
20 Ca 
40.08
21
Sc
44.96
22
Ti
47.88
23
V
50.94

24
Cr
52.00

25
Mn
54.94

26
Fe
55.85
27
Co
58.93
28
Ni
58.69

29
Cu
63.55

30
Zn
65.39
31
Ga
69.72
32
Ge
72.59
33
As
74.92
34
Se
78.96
35
Br
79.90
36
Kr
83.80
 
5 37
Rb
85.47
38
Sr
87.62
39
Y
88.91
40
Zr
91.22
41
Nb
92.91
42
Mo
95.94
43
Tc
(98)
44
Ru
101.1
45
Rh
102.9
46
Pd
106.4
47
Ag
107.9
48
Cd
112.4
49
In
114.8
50
Sn
118.7
51
Sb
121.8
52
Te
127.6
53
I
126.9
54
Xe
131.3
 
6 55 Cs
132.9
56
Ba
137.3
57
La *138.9
72
Hf
178.5
73
Ta
180.9
74
W
183.9
75
Re
186.2
76
Os
190.2
77
Ir
192.2
78
Pt
195.1
79
Au
197.0
80
Hg
200.5
81
Tl
204.4
82
Pb
207.2
83
Bi
209.0
84
Po
(210)
85
At
(210)
86
Rn
(222)
 
7 87
Fr
(223)
88
Ra
(226)
89
Ac ~(227)
104
Rf
(257)
105
Db
(260)
106
Sg
(263)
107
Bh
(262)
108
Hs
(265)
109
Mt
(266)
110
Ds
(269)
111
Rg
(272)
112
Cn
(277)
113
Uut
(?)
114
Uuq
(285)
115
Uup
(?)
116
Uuh
(289)
117
Uus
(?)
118
Uuo
(?)
 
 

Lanthanide Series* 58
Ce
140.1
59
Pr
140.9
60
Nd
144.2
61
Pm
(147)
62
Sm
150.4
63
Eu
152.0
64
Gd
157.3
65
Tb
158.9
66
Dy
162.5
67
Ho
164.9
68
Er
167.3
69
Tm 168.9
70
Yb
173.0
71
Lu
175.0
Actinide Series~ 90
Th
232.0
91
Pa
(231)
92
U
(238)
93
Np
(237)
94
Pu
(242)
95
Am
(243)
96
Cm
(247)
97
Bk
(247)
98
Cf
(249)
99
Es
(254)
100
Fm
(253)
101
Md
(256)
102
No
(254)
103
Lr
(257)

** Groups are noted by 3 notation conventions.

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 Last Updated:
12/11/2003

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