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Periodic Table of the Elements

Links to Tables showing Periodic Element Groups.

[ Alkali Metals ] [ Alkaline Earth Metals ] [ Blocks ] [ Gases ] [ Halogens ] [ Lanthanides/Actinides ] [ Liquids (stp) ] [ Main Group ] [ Metalloids ] [ Metals ] [ Noble Gases ] [ Non-Metals ] [ Solids (stp) ] [ Transition Metals ]

Main Group

The main group elements of the periodic table are those elements that belong to the "s" and "p" blocks. Counting the columns or table groups across the table ignoring the transition elements gives 8 element groups which match the filling of the eight spaces for electrons in the ns and np subshells, ns2np6. The "s" subshell can hold two electrons while the "p" subshell can hold six electrons for a total of eight. One good aspect about the 1A to 8A group numbering system is that the group number indicates the number of valence ( outer ) electrons for atoms in the main group elements.

Point at or click an element for more information:

       
Group***

Period
1
IA
1A
2
IIA
2A
3
IIIB
3B
4
IVB
4B
5
VB
5B
6
VIB
6B
7
VIIB
7B
8
VIII
8
9
VIII
8
10
VIII
8
11
IB
1B
12
IIB
2B
13
IIIA
3A
14
IVA
4A
15
VA
5A
16
VIA
6A
17
VIIA
7A
18
VIIIA
8A
11
H

1.008
2
He
4.003
23
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
311
Na

22.99
12
Mg

24.31
13
Al
26.98
14
Si
28.09
15
P
30.97
16
S
32.07
17
Cl
35.45
18
Ar
39.95
419
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
58.47
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
537
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
655
Cs
132.9
56
Ba
137.3

*
72
Hf
178.5
73
Ta
180.9
74
W
183.9
75
Re
186.2
76
Os
190.2
77
Ir
190.2
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
(209)
85
At
(210)
86
Rn
(222)
787
Fr
(223)
88
Ra
(226)

**
104
Rf
(261)
105
Db
(262)
106
Sg
(266)
107
Bh
(264)
108
Hs
(269)
109
Mt
(268)
110
Ds
(281)
111
Rg
(272)
112
Uub
(285)
113
Uut
(284)
114
Uuq
(289)
115
Uup
(288)
116
Uuh
(292)
117
Uus
()
118
Uuo
(294)
 

 

Lanthanide Series*
(Lanthanoid)
57
La
138.9
58
Ce
140.1
59
Pr
140.9
60
Nd
144.2
61
Pm
(145)
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**
(Actinoids)
89
Ac
(227)
90
Th
232.0
91
Pa
(231)
92
U
(238)
93
Np
(237)
94
Pu
(244)
95
Am
(243)
96
Cm
(247)
97
Bk
(247)
98
Cf
(251)
99
Es
(252)
100
Fm
(257)
101
Md
(258)
102
No
(259)
103
Lr
(262)

***Groups are by 3 notation conventions.

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