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Periodic table (of the elements)
Metals
Metalloids (semi-metals)
(9)
(10) (11) (12) (13) (14) (15) (16) (17) (18)
Non-metals
Inner transition metals
Atomic (proton) number (equivalent to number of electrons). For a definition see page 6.
Symbol
Name
mass (approximate atomic weight). For a definition see page 39. Those in parentheses are radioactive.
3 4 5 6 7 8 or 0
13
Al
Aluminium 27
Approximate relative atomic
56
13 14
7
16 17 18
2
27 28 29 30
BC
Boron Carbon 11 12
Al Si
Aluminium Silicon 27 28
31 32
N
Nitrogen 14
15
8 9 10
S Cl Ar
Sulphur Chlorine Argon 32 35 40
34 35 36
He
Helium 4
O F Ne
Oxygen Fluorine Neon 16 19 20
P
Phosphorus 31
33
Co Ni Cu Zn
Cobalt Nickel Copper Zinc 59 59 64 65
45 46 47 48
Ga Ge
Gallium Germanium 70 73
49 50
As
Arsenic 75
51
Se Br Kr
Selenium Bromine Krypton 79 80 84
52 53 54
Rh Pd Ag Cd
Rhodium Palladium Silver Cadmium 103 106 108 112
77 78 79 80
In Sn
Indium Tin 115 119
81 82
Sb
Antimony 122
83
Te I Xe
Tellurium Iodine Xenon 128 127 131
84 85 86
Ir Pt Au Hg
Iridium Platinum Gold Mercury 192 195 197 201
109 110 111 112
Tl Pb
Thallium Lead 204 207
Ununquadium (289)
114
Bi
Bismuth 209
Po At Rn
Polonium (209)
Ununhexium (289)
Astatine (210)
Radon (222)
116
118
Mt Uun Uuu Uub
Meitnerium Ununnilium Unununium Ununbium (266) (272) (272) (277)
Uuq
Uuh
Uuo
Ununoctium (293)
61
Pm
Promethium (145)
Neptunium (237)
93
Np
62
Sm
Samarium 150
94
Pu
Plutonium (244)
63
Eu
Europium 152
Americium (243)
95
Am
64
Gd
Gadolinium 157
Curium (247)
96
Cm
65
Tb
Terbium 159
Berkelium (247)
97
Bk
66
Dy
Dysprosium 163
98
Cf
Californium (251)
67
Ho
Holmium 165
99
Es
Einsteinium (252)
68
Er
Erbium 167
100
Fm
Fermium (257)
69
Tm
Thulium 169
101
Md
Mendelevium (258)
70
Yb
Ytterbium 173
102
No
Nobelium (259)
35
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