7
6
5
4
3
2
Ra
Radium
Fr
88
87
Francium
Ba
Barium
Cs
56
55
Cesium
Sr
Strontium
Rb
38
37
Rubidium
Ca
Kalsium
K
20
19
Kalium
Mg
12
11
Magnesium
Beryllium
Litium
Na
Be
Li
Natrium
4
2
3
Hydrogen
H
1
1
1
1
Gruppe
Periode
3
89-103
57-71
Yttrium
Y
39
Scandium
Sc
21
Periodesystemet 5
Mo W
90
Th Thorium
89
Ac
Actinium
Protactinium
Pa
91
Praseodym
Pr
Ce Cerium
La
Lantan
59
58
57
Seaborgium
Sg
106
Dubnium
Db
105
Wolfram
Ta Tantal
74
73
Molybden
Nb Niob
42
Krom
Cr
24
41
Vanadium
V
23
Navn
Atomsymbol
Atomnummer
7
Pm
Neptunium
Np
U Uran
93
92
Promethium
Nd Neodym
61
Hassium
Hs
108
Osmium
Os
76
Ruthenium
Ru
44
Jern
Fe
Cu
Ds
110
Platina
Pt
78
Rg
111
Gull
Au
79
Sølv
Ag
Pd
Palladium
47
46
Kobber
Kadmium
Cd
48
Sink
Zn
Plutonium
Pu
94
Samarium
Sm
62
Americium
Am
95
Europium
Eu
63
Curium
Cm
96
Gadolinium
Gd
64
Ga
Indium
In
49
Gallium
Dy
Berkelium
Bk
97
Es
99
Holmium
Ho
67
Flerovium
Fl
114
Bly
Pb
82
Tinn
Sn
50
Germanium
Ge
32
Californium Einsteinium
Cf
98
Dysprosium
Tb Terbium
66
65
Nihonium
Nh
113
112
Cn
Thallium
Tl
81 Kvikksølv
Hg
80
pl ar
ek se m
Ni
Nikkel
Meitnerium Darmstadtium Røntgenium Copernicium
Mt
109
Iridium
Ir
77
Rhodium
Rh
45
Kobolt
Co
gs 31
Silisium
in
26
Aluminium
Si
C
B Al
6
14
5
13
14
30
12
13
29
11
Ikke-metall
28
10
Karbon
27
9
Bor
60
Bohrium
Bh
107
Rhenium
Re
75
Technetium
Tc
43
Mangan
Mn
25
Halvmetall
Metall
8
er
rd
Vu
6
Rutherfordium
Rf
104
Hafnium
Hf
72
Zirkonium
Zr
40
Titan
Ti
22
Kalsium
Ca
20
Forklaring
4
O
Fermium
Fm
100
Erbium
Er
68
Moscovium
Mc
115
Vismut
Bi
83
Antimon
Sb
51
Arsen
As
33
Fosfor
P
15
Mendelevium
Md
101
Thulium
Tm
69
Livermorium
Lv
116
Polonium
Po
84
Tellur
Te
52
Selen
Se
34
Svovel
S
16
Oksygen
N Nitrogen
8
16
7
15
Ar
Nobelium
No
102
Ytterbium
Yb
70
Tennessine
Ts
117
Astat
At
85
Jod
I
53
Brom
Br
35
Lawrencium
Lr
103
Lutetium
Lu
71
Oganesson
Og
118
Radon
Rn
86
Xenon
Xe
54
Krypton
Kr
36
Argon
Cl Klor
18
Neon
Ne
10
Helium
He
2
18
17
Fluor
F
9
17
PERIODESYSTEMET
255
