Periodic Table of the Elements
Group 1
Group 2
Group 3
Group 4
Group 5
Group 6
Group 7
Group 8
Group 9
Group 10
Group 11
Group 12
Group 13
Group 14
Group 15
Group 16
Group 17
Group 18
Period 1
1
H
Hydrogen
1.008
<-- Atomic Number
<-- Symbol
<-- Name
<-- Atomic Weight
2
He
Helium
4.002602(2)
Period 2
3
Li
Lithium
6.94
4
Be
Beryllium
9.0121831(5)
5
B
Boron
10.81
6
C
Carbon
12.011
7
N
Nitrogen
14.007
8
O
Oxygen
15.999
9
F
Flourine
18.998403163(6)
10
Ne
Neon
20.1797(6)
Period 3
11
Na
Sodium
22.98976928(2)
12
Mg
Magnesium
24.305
13
Al
Aluminum
26.9815385(7)
14
Si
Silicon
28.085
15
P
Phosphorus
30.973761998(5)
16
S
Sulfur
32.06
17
Cl
Chlorine
35.45
18
Ar
Argon
39.948(1)
Period 4
19
K
Potassium
39.0983(1)
20
Ca
Calcium
40.078(4)
21
Sc
Scandinum
44.955908(5)
22
Ti
Titanium
47.867(1)
23
V
Vanadium
50.9415(1)
24
Ch
Chromium
51.9961(6)
25
Mn
Manganese
54.938044(3)
26
Fe
Iron
55.845(2)
27
Co
Cobalt
58.933194(4)
28
Ni
Nickel
58.6934(4)
29
Cu
Copper
63.546(3)
30
Zn
Zinc
65.38(2)
31
Ga
Gallium
69.723(1)
32
Ge
Germanium
72.630(8)
33
As
Arsenic
74.921595(6)
34
Se
Selenium
78.971(8)
35
Br
Bromine
79.904
36
Kr
Krypton
83.798(2)
Period 5
37
Rb
Rubidium
85.4678(3)
38
Sr
Strontium
87.62(1)
39
Y
Yttrium
88.90584(2)
40
Zr
Zirconium
91.224(2)
41
Nb
Niobium
92.90637(2)
42
Mo
Molybdenum
95.95(1)
43
Tc
Technetium
[98]
44
Ru
Ruthenium
101.07(2)
45
Rh
Rhodium
102.90550(2)
46
Pd
Palladium
106.42(1)
47
Ag
Silver
107.8682(2)
48
Cd
Cadmium
112.414(4)
49
In
Indium
114.818(1)
50
Sn
Tin
118.710(7)
51
Sb
Antimony
121.760(1)
52
Te
Tellurium
127.60(3)
53
I
Iodine
126.90447(3)
54
Xe
Xenon
131.293(6)
Period 6
55
Cs
Caesium
132.90545196(6)
56
Ba
Barium
137.327(7)
57
La
Lanthanum
138.90547(7)
58-71
see
below
72
Hf
Hafnium
178.49(2)
73
Ta
Tantalum
180.94788(2)
74
W
Tungsten
183.84(1)
75
Re
Rhenium
186.207(1)
76
Os
Osmium
190.23(3)
77
Ir
Iridium
192.217(3)
78
Pt
Platinum
195.084(9)
79
Au
Gold
196.966569(5)
80
Hg
Mercury
200.592(3)
81
Tl
Thallium
204.38
82
Pb
Lead
207.2(1)
83
Bi
Bismuth
208.98040(1)
84
Po
Polonium
[209]
85
At
Astatine
[210]
86
Rn
Radon
[222]
Period 7
87
Fr
Francium
[223]
88
Ra
Radium
[226]
89
Ac
Actinium
[227]
90-103
see
below
104
Rf
Rutherfordium
[267]
105
Db
Dubnium
[268]
106
Sg
Seaborgium
[269]
107
Bh
Bohrium
[270]
108
Hs
Hassium
[277]
109
Mt
Meitnerium
[278]
110
Ds
Darmstadtium
[281]
111
Rg
Roentgenium
[282]
112
Cn
Copernicium
[285]
113
Nh
Nihonium
[286]
114
Fl
Flerovium
[289]
115
Mc
Moscovium
[290]
116
Lv
Livermorium
[293]
117
Ts
Tennessine
[294]
118
Og
Oganesson
[294]
58
Ce
Cerium
140.116(1)
59
Pr
Praseodymium
140.90766(2)
60
Nd
Neodymium
144.242(3)
61
Pm
Promethium
[145]
62
Sm
Samarium
150.36(2)
63
Eu
Europium
151.964(1)
64
Gd
Gadolinium
157.25(3)
65
Tb
Terbium
158.92535(2)
66
Dy
Dysprosium
162.500(1)
67
Ho
Holmium
164.93033(2)
69
Er
Erbium
167.259(3)
69
Tm
Thulium
[168.93422(2)
70
Yb
Ytterbium
173.045(10)
71
Lu
Lutetium
174.9668(1)
90
Th
Thorium
232.0377(4)
91
Pa
Protactinium
231.03588(2)
92
U
Uranium
238.02891(3)
93
Np
Neptunium
[237]
94
Pu
Plutonium
[244]
95
Am
Americium
[243]
96
Cm
Curium
[247]
97
Bk
Berkelium
[247]
98
Cf
Californium
[251]
99
Es
Einsteinium
[252]
100
Fm
Fermium
[257]
101
Md
Mendelevium
[258]
102
No
Nobelium
[259]
103
Lr
Lawrencium
[266]
E l e m e n t C a t e g o r i e s
Alkali metal
Alkaline earth metal
Lanthanide metal
Actinide metal
Transition metal
Post-transition metal
Metalloid
Polyatomic nonmetal
Diatomic nonmetal
Noble gas
Unknown