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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 ]

Metalloids

The metalloids; boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te), polonium (Po) and astatine (At) are the elements found along the step like line between metals and non-metals of the periodic table. Metalloids have properties of both metals and non-metals. Some of the metalloids, such as silicon and germanium, are useful in semi-conductors. This property makes metalloids useful in electronic components.

Some allotropes of elements show more pronounced metal, metalloid or non-metal behaviour than others. The element carbon; its diamond allotrope is non-metallic, however the graphite allotrope is electrically conductive showing characteristic more like a metalloid. Phosphorus, tin, selenium and bismuth also have allotropes which display borderline behaviour.

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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