Platinum group metals

The Group 1 elements

The Group 1 elements other than hydrogen are called the alkali metals. The Group 1 elements are:

The Group 1 metals are all highly reactive silvery metals that are so reactive to air and moisture that they must be stored under an inert atmosphere or oil. They are all soft and can be cut easily with a knife.

Hydrogen is usually placed at the top of the Group but is not a Group 1 metal.

The electronic configuration of the elements all consist of a lone s-electron outside an inner core of electron corresponding to the previous inert gas.

Periodic Table

This is the start of the WebElements periodic table documentation

List of elements by atomic number

Here is a list of the elements sorted by atomic number.

Janet periodic table

The Janet periodic table

The Janet periodic table is an excellent alternative periodic table and organises elements according to orbital filling. Therefore, hydrogen is above lithium on the grounds they are both ns1, and helium above beryllium on the grounds they are both ns2. Current Group numbers are displayed to help orientation with the standard table.

Element nameElement symbolAtomic number
HydrogenH1
HeliumHe2
LithiumLi3
The JANET periodic table.
Group   3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 1 2
Period
1 1
H
2
He
1 3
Li
4
Be
2 5
B
6
C
7
N
8
O
9
F
10
Ne
11
Na
12
Mg
3 13
Al
14
Si
15
P
16
S
17
Cl
18
Ar
19
K
20
Ca
4 21
Sc
22
Ti
23
V
24
Cr
25
Mn
26
Fe
27
Co
28
Ni
29
Cu
30
Zn
31
Ga
32
Ge
33
As
34
Se
35
Br
36
Kr
37
Rb
38
Sr
5 39
Y
40
Zr
41
Nb
42
Mo
43
Tc
44
Ru
45
Rh
46
Pd
47
Ag
48
Cd
49
In
50
Sn
51
Sb
52
Te
53
I
54
Xe
55
Cs
56
Ba
6 57
La
58
Ce
59
Pr
60
Nd
61
Pm
62
Sm
63
Eu
64
Gd
65
Tb
66
Dy
67
Ho
68
Er
69
Tm
70
Yb
71
Lu
72
Hf
73
Ta
74
W
75
Re
76
Os
77
Ir
78
Pt
79
Au
80
Hg
81
Tl
82
Pb
83
Bi
84
Po
85
At
86
Rn
87
Fr
88
Ra
7 89
Ac
90
Th
91
Pa
92
U
93
Np
94
Pu
95
Am
96
Cm
97
Bk
98
Cf
99
Es
100
Fm
101
Md
102
No
103
Lr
104
Rf
105
Db
106
Sg
107
Bh
108
Hs
109
Mt
110
Ds
111
Rg
112
Cp
113
Uut
114
Uuq
115
Uup
116
Uuh
117
Uus
118
Uuo
119
Uue
120
Ubn

Extended periodic table

This is the extended version of the periodic table

Mendeleev's periodic table

The Mendeleev Periodic Table

This table shows the form of Mendeleev's Periodic Table of the chemical elements as published in 1872. The heading "Reihen" means "Row" and the heading "Gruppe" means "Group". The symbols R2O and RH4, etc., are written in the style of the time which uses superscripts to denote the number of atoms in molecules rather than the current style which uses subscripts. The gaps marked with hyphens ("-") represent chemical elements deduced by Mendeleev as existing but unknown in 1872. He was able to predict with considerable success the properties of some of the missing chemical elements such as germanium.

Group 1 2   3 4 5 6 7 8 9 10 11 12 13 14 15
Reihen Gruppe I.
-
R2O
Gruppe II.
-
RO
Gruppe III.
-
R2O3
Gruppe IV.
RH4
RO2
Gruppe V.
RH3
R2O5
Gruppe VI.
RH2
RO3
Gruppe VII.
RH
R2O7
Gruppe VIII.
-
RO4
1 H=1
2 Li=7 Be=9,4 B=11 C=12 N=14 O=16 F=19
3 Na=23 Mg=24 Al=27,3 Si=28 P=31 S=32 Cl=35,5
4 K=39 Ca=40 -=44 Ti=48 V=51 Cr=52 Mn=55 Fe=56, Ce=59,
Ni=59, Cu=63.
5 (Cu=63) Zn=65 -=68 -=72 As=75 Se=78 Br=80
6 Rb=85 Sr=87 ?Yt=88 Zr=90 Nb=94 Mo=96 -=100 Ru=104, Rh=104,
Pd=106, Ag=108.
7 (Ag=108) Cd=112 In=113 Sn=118 Sb=122 Te=125 J=127
8 Cs=133 Ba=137 ?Di=138 ?Ce=140 - - - - - - -
9 (-) - - - - - -
10 - - ?Er=178 ?La=180 Ta=182 W=184 - Os=195, Ir=197,
Pt=198, Au=199
11 (Au=199) Hg=200 Tl=204 Pb=207 Bi=208 - -
12 - - - Th=231 - U=240 - - - - -

WebElements: the periodic table on the WWW [http://www.webelements.com/]

Copyright 1993-2011 Mark Winter [The University of Sheffield and WebElements Ltd, UK]. All rights reserved.