www.ec.europa.eu/science-girl-thing
WOMEN IN RESEARCH
AND INNOVATION
An initiative
of the
KI-01-13-116-EN-C
PERIODIC TABLE OF THE ELEMENTS
Group
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Period
1
1
2
1
Atomic number
H
Electrons per shell
Lithium
3
Na
2
8
1
Sodium
19
K
Rb
Rubidium
6
Cs
Caesium
132.9054519
87
7
Fr
20
Ca
Al
Atomic weight
38
Sr
Strontium
56
Ba
Barium
137.327
2
8
18
32
18
8 Radium
1 [ 226 ]
Ra
Sc
39
Y
Yttrium
2
8
18
32
18
8
2
40
Zr
Zirconium
57-71
Lanthanoids
Hf
Hafnium
178.49
Ac
Actinium
[227]
Nb
Niobium
73
Ta
Tantalum
180.94788
105
2
8
18
18
9
2
58
Ce
Cerium
140.116
90
2
8
18
32
18
9 Thorium
2 232.03806
Th
Db
2
8
18
19
9
2
59
24
Cr
2
8
18
32
11
2
42
Mo
25
Mn
43
Tc
Technetium
95.96
[ 98 ]
W
Tungsten
183.84
2
8
18
32
12
2
75
Re
Rhenium
186.207
106
2
8
18
32
32
12 Bohrium
2 [ 272 ]
60
2
8
18
22
8
2
2
8
18
32
32
11 Seaborgium
2 [ 271 ]
Sg
Pr
Nd
140.90765
144.242
91
92
Neodymium
2
2
8
8
18
18
32
32
18
20
10 Protactinium 9 Uranium
2 231.03588
2 238.02891
U
26
Fe
44
Ru
Ruthenium
76
Os
Osmium
190.23
2
8
18
32
32
13 Hassium
2 [ 270 ]
61
2
8
18
23
8
2
Pm
Promethium
[ 145 ]
93
2
8
18
32
21
9 Neptunium
2 [ 237 ]
Np
Co
45
Rh
Rhodium
77
Ir
Iridium
192.217
2
8
18
32
32
14 Meitnerium
2 [ 276]
62
2
8
18
24
8
2
Sm
Samarium
Ni
46
Pd
Pt
Platinum
195.084
63
2
8
18
25
8
2
Eu
Europium
151.964
94
95
2
2
8
8
18
18
32
32
22
24
9 Plutonium 8 Americium
2 [ 244 ]
2 [ 243 ]
Am
Cu
2
8
18
1
47
Ag
Silver
79
Au
Gold
196.966569
Zn
2
8
18
2
48
Cd
Cadmium
Hg
Mercury
200.59
49
In
Indium
Tl
Thallium
204.3833
2
2
2
8
8
8
18
18
18
32
32
32
32
32
32
Roentgenium
Copernicium
17
18
18 Ununtrium
1 [ 280 ]
1 [ 285 ]
2 [ 286 ]
64
2
8
18
25
9
2
Gd
Gadolinium
157.25
96
2
8
18
32
25
8 Curium
2 [ 247 ]
Cm
112
81
Rg
65
Tb
Terbium
Cn
2
8
18
27
8
2
66
Dy
Dysprosium
158.9253
162.5
97
98
2
2
8
8
18
18
32
32
25
27
9 Berkelium 8 Californium
2 [ 247 ]
2 [ 251 ]
Bk
Cf
32
Ge
50
Sn
Tin
82
Pb
Lead
207.2
67
2
8
18
29
8
2
Holmium
164.93032
99
2
8
18
32
28
8 Einsteinium
2 [ 252 ]
Es
P
33
As
2
8
5
Sb
Antimony
83
Bi
Bismuth
208.9804
34
Se
52
Te
Tellurium
Po
Polonium
[ 209 ]
2
2
8
8
18
18
32
32
32
32
Ununpentium
18 Livermorium
18
5 [ 293 ]
4 [ 288 ]
68
2
8
18
30
8
2
Er
Erbium
167.259
100
2
8
18
32
29
8 Fermium
2 [ 257 ]
Fm
115
84
Uup
69
Tm
Thulium
Br
2
8
8
K
L
M
2
8
18
8
K
L
M
N
2
8
18
18
8
K
L
M
N
O
2
8
18
32
18
8
K
L
M
N
O
P
2
8
18
32
32
18
8
K
L
M
N
O
P
Q
Argon
39.948
2
8
18
7
Bromine
53
I
Iodine
85
At
Astatine
[ 210 ]
Kr
83.798
2
8
18
18
7
126.90447
2
8
18
32
18
6
36
Krypton
79.904
2
8
18
18
6
Ar
54
Xe
Xenon
131.293
2
8
18
32
18
7
Rn
Radon
[ 222 ]
70
2
8
18
32
8
2
Yb
Ytterbium
173.054
101
102
2
2
8
8
18
18
32
32
30
31
8 Mendelevium 8 Nobelium
2 [ 258 ]
2 [ 262 ]
No
117
86
2
2
8
8
18
18
32
32
32
32
Ununseptium
18
18 Ununoctium
6 [ 294 ]
7 [ 294 ]
168.93421
Md
35
18
116
Lv
2
8
18
31
8
2
Cl
Ne
20.1797
2
8
7
35.453
127.6
2
8
18
32
18
5
17
10
Neon
Chlorine
2
8
18
6
78.96
114
Fl
2
8
6
Selenium
2
8
18
18
5
121.76
2
8
18
32
18
4
S
F
18.9984032
32.065
74.9216
51
16
9
2
7
Fluorine
Sulfur
2
8
18
5
Arsenic
2
8
18
18
4
O
15.9994
30.973762
118.71
2
8
18
32
18
3
15
8
2
6
Oxygen
Phosphorus
2
8
18
4
72.64
2
8
18
32
32
18 Flerovium
3 [ 289 ]
Ho
2
8
4
Germanium
2
8
18
18
3
113
Uut
2
8
18
28
8
2
Si
N
14.0067
28.0855
114.818
2
8
18
32
18
2
110
Ds
111
80
Ga
14
7
2
5
Nitrogen
Silicon
2
8
18
3
69.729
2
8
18
18
2
112.411
2
8
18
32
18
1
31
Gallium
65.38
2
8
18
18
1
107.8682
2
8
18
32
17
1
30
Zinc
63.546
Palladium
78
29
Copper
2
8
18
18
106.42
2
8
18
32
15
2
2
8
18
32
32
15 Darmstadtiu
2 [ 281 ]
Mt
2
8
16
2
58.6934
109
150.36
Pu
28
Nickel
2
8
18
16
1
102.9055
2
8
18
32
14
2
108
Hs
2
8
15
2
58.933195
2
8
18
15
1
101.07
2
8
18
32
13
2
27
Cobalt
55.845
2
8
18
13
2
107
Bh
2
8
14
2
Iron
54.938045
2
8
18
13
1
Molybdenum
74
2
8
13
2
Manganese
51.9961
2
8
18
21
8
Praseodymiu 2
Pa
2
8
13
1
Chromium
2
8
18
12
1
92.9063
2
8
18
32
10
2
Rf
Actinoids
89
41
2
8
18
32
32
Rutherfordium10 Dubnium
2 [ 268 ]
[ 267 ]
89-103
Lanthanum
V
2
8
11
2
50.9415
104
La
23
Vanadium
2
8
18
10
2
91.224
72
138.90547
Actinoids
Ti
2
8
10
2
47.867
2
8
18
9
2
88.90585
2
8
18
18
8
2
22
Titanium
44.9559
57
Lanthanoids
2
8
9
2
Scandium
2
8
18
8
2
87.62
2
8
18
18
8
1
2
8
3
Aluminium
21
C
12.0107
26.9815386
2
8
8
2
40.078
88
Francium
[ 223 ]
Mg
13
6
2
4
Carbon
10.811
Name
2
8
2
Calcium
2
8
18
8
1
85.4678
55
12
2
3
Boron
Hydrogen
Magnesium
Potassium
37
B
24.305
2
8
8
1
39.0983
5
Be
5
Symbol
9.012182
22.98976928
4
4
2
2
Beryllium
6.941
11
K
L
4.002602
2
1
Li
2
8
Helium
1.00794
2
K
He
Hydrogen
3
2
118
Uus
71
Uuo
2
8
18
32
9
2
K
L
M
N
O
P
2
2
8
8
18
18
32
32
32
32
8 Lawrencium 8
2 [ 262 ]
3
K
L
M
N
O
P
Q
Lu
Lutetium
174.9668
103
Lr