American Chemical Society www.acs.org/outreach
57-71
Lithium
6.94
Beryllium
9.012
Sodium
22.99
Magnesium
24.31
Francium
(223)
Radium
(226)
Rutherfordium
(265)
Dubnium
(268)
Seaborgium
(271)
Bohrium
(270)
Caesium
132.9
Barium
137.3
Hafnium
178.5
Tantalum
180.9
Tungsten
183.9
Rhenium
186.2
Rubidium
85.47
Strontium
87.62
Yttrium
88.91
Zirconium
91.22
Niobium
92.91
Molybdenum
95.96
Technetium
(98)
Potassium
39.10
Calcium
40.08
Scandium
44.96
Titanium
47.88
Vanadium
50.94
Chromium
52.00
Manganese
54.94
Hassium
(277)
Meitnerium
(276)
Darmstadtium
(281)
Roentgenium
(280)
Osmium
190.2
Iridium
192.2
Platinum
195.1
Gold
197.0
Mercury
200.5
Ruthenium
101.1
Rhodium
102.9
Palladium
106.4
Silver
107.9
Cadmium
112.4
Iron
55.85
Cobalt
58.93
Nickel
58.69
Copper
63.55
Zinc
65.39
Boron
10.81
Carbon
12.01
Nitrogen
14.01
Oxygen
16.00
Aluminium
26.98
Silicon
28.09
Phosphorus
30.97
Sulfur
32.06
Nihonium
(284)
Flerovium
(289)
Moscovium
(288)
Livermorium
(293)
Thallium
204.38
Lead
207.2
Bismuth
209.0
Polonium
(209)
Indium
114.8
Tin
118.7
Antimony
121.8
Tellurium
127.6
Gallium
69.72
Germanium
72.64
Arsenic
74.92
Selenium
78.96
Helium
4.003
Fluorine
19.00
Chlorine
35.45
Tennessine
(294)
Oganesson
(294)
Astatine
(210)
Radon
(222)
Iodine
126.9
Xenon
131.3
Bromine
79.90
Lanthanum
138.9
Cerium
140.1
Praseodymium
140.9
Neodymium
144.2
Samarium
150.4
Europium
152.0
Gadolinium
157.2
Terbium
158.9
Dysprosium
162.5
Holmium
164.9
Erbium
167.3
Thulium
168.9
Ytterbium
173.0
Lutetium
175.0
Actinium
(227)
Thorium
232.0
Protactinium
231.0
Uranium
238.0
Neptunium
(237)
Plutonium
(244)
Americium
(243)
Curium
(247)
Berkelium
(247)
Californium
(251)
Einsteinium
(252)
Fermium
(257)
Mendelevium
(258)
Nobelium
(259)
Lawrencium
(262)
Copernicium
(285)
Promethium
(145)
Hydrogen
1.008
H He
Li Be B C N O F Ne
Na Mg Al Si P S Cl Ar
La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr
Fr Ra Rf Db Sg Bh Hs Mt Ds Rg Nh Fl Mc Lv Ts Og
Cs Ba Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn
Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe
K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr
Krypton
83.79
Cn
Pm
1
3 4
12
20 21 22 23 24 25 26 27 28 29 30
39 40 41 42 43 44 45 46 47 48
38
56
88
11
19
37
55
87
72 73 74 75 76 77 78 79 80
104 105 106 107 108 109 110 111 112
5857 59 60 61 62 63 64 65 66
9089 91 92 93 94 95 96 97 98
67 68 69 70
71
113
114 115 116 117 118
81 82 83 84
85
86
99 100
101 102
103
49 50 51 52
53
54
31 32 33 34
35
36
Argon
39.95
13 14 15 16 17 18
Neon
20.18
5 6 7 8
9 10
2
Lanthanides
89-103
Actinides
GROUP
Non-metals
Halogens
Noble Gases
Lanthanides
Actinides
Alkali Metals
Alkaline Earth Metals
Other Metals
Metalloids
Transition Metals
Platinum
195.1
Pt
78
Atomic Number
Symbol
Name
Average Atomic Mass
1
PERIOD
1
2
3
4
5
6
7
2
3 4 5 6 7 108 9 11
13
12
14 15
18
1716
