Periodic Table

Definition, mass & chemical names

Interactive Periodic Table

An easy to use guide to the elements of the periodic table, including their history, discovery, physical and chemical characteristics, their uses, significance, and much more!

1
18
1

H

Hydrogen1.0081
2
Atomic No.(#)

Symbol

NameAtomic mass
[Orbital arrangement]
13
14
15
16
17
2

He

Helium4.0032
3

Li

Lithium6.9402
1
4

Be

Beryllium9.0122
2
5

B

Boron10.8102
3
6

C

Carbon12.0112
4
7

N

Nitrogen14.0072
5
8

O

Oxygen15.9992
6
9

F

Fluorine18.9982
7
10

Ne

Neon20.1802
8
11

Na

Sodium22.9902
8
1
12

Mg

Magnesium24.3052
8
2
3
4
5
6
7
8
9
10
11
12
13

Al

Aluminium26.9822
8
3
14

Si

Silicon28.0852
8
4
15

P

Phosphorus30.9742
8
5
16

S

Sulfur32.062
8
6
17

Cl

Chlorine35.452
8
7
18

Ar

Argon39.9482
8
8
19

K

Potassium39.0982
8
8
1
20

Ca

Calcium40.0782
8
8
2
21

Sc

Scandium44.9562
8
9
2
22

Ti

Titanium47.8672
8
10
2
23

V

Vanadium50.9422
8
11
2
24

Cr

Chromium51.9962
8
13
1
25

Mn

Manganese54.9382
8
13
2
26

Fe

Iron55.8452
8
14
2
27

Co

Cobalt58.9332
8
15
2
28

Ni

Nickel58.6932
8
16
2
29

Cu

Copper63.5462
8
18
2
30

Zn

Zinc65.382
8
18
2
31

Ga

Gallium69.7232
8
18
4
32

Ge

Germanium72.632
8
18
4
33

As

Arsenic74.9212
8
18
5
34

Se

Selenium78.9712
8
18
6
35

Br

Bromine79.9042
8
18
7
36

Kr

Krypton83.7682
8
18
8
37

Rb

Rubidium84.4682
8
18
8
1
38

Sr

Strontium87.6202
8
18
8
2
39

Y

Yttrium88.9062
8
18
9
2
40

Zr

Zirconium91.2242
8
18
10
2
41

Nb

Niobium92.9062
8
18
12
2
42

Mo

Molybdenum95.952
8
18
13
1
43

Tc

Technetium98.9072
8
18
13
2
44

Ru

Ruthenium101.072
8
18
15
1
45

Rh

Rhodium102.9062
8
18
16
1
46

Pd

Palladium106.422
8
18
18
47

Ag

Silver107.8682
8
18
18
1
48

Cd

Cadmium112.4112
8
18
18
2
49

In

Indium114.8182
8
18
32
3
50

Sn

Tin118.7112
8
18
32
4
51

Sb

Antimony121.762
8
18
32
5
52

Te

Tellurium127.62
8
18
32
6
53

I

Iodine126.9042
8
18
18
7
54

Xe

Xenon131.2942
8
18
18
8
55

Cs

Caesium132.9052
8
18
18
8
1
56

Ba

Barium137.3282
8
18
18
8
1
57-71

 

Lanthanoids
72

Hf

Hafnium178.492
8
18
32
10
2
73

Ta

Tantalum180.9482
8
18
32
11
2
74

W

Tungsten183.842
8
18
32
12
2
75

Re

Rhenium186.2072
8
18
32
13
2
76

Os

Osmium190.232
8
18
32
14
2
77

Ir

Iridium192.2172
8
18
32
15
2
78

Pt

Platinum195.0852
8
18
32
17
1
79

Au

Gold196.9672
8
18
32
18
1
80

Hg

Mercury200.5922
8
18
32
18
2
81

Tl

Thallium204.3832
8
18
32
18
3
82

Pb

Lead207.22
8
18
32
18
4
83

Bi

Bismuth208.982
8
18
32
18
5
84

Po

Polonium(208.982)2
8
18
32
18
6
85

At

Astatine209.9872
8
18
32
18
7
86

Rn

Radon222.0182
8
18
32
18
8
87

Fr

Francium223.022
8
18
32
18
8
1
88

Ra

Radium226.0252
8
18
32
18
8
2
89-103

 

Actinoids
104

Rf

Rutherfordium(263)2
8
18
32
32
10
2
105

Db

Dubnium(268)2
8
18
32
32
11
2
106

Sg

Seaborgium(271)2
8
18
32
32
11
2
107

Bh

Bohrium(270)2
8
18
32
32
12
2
108

Hs

Hassium(270)2
8
18
32
32
13
2
109

Mt

Meitnerium(278)2
8
18
32
32
14
2
110

Ds

Darmstadtium(281)2
8
18
32
32
15
2
111

Rg

Roentgenium(281)2
8
18
32
32
18
1
112

Cn

Copernicium(285)2
8
18
32
32
18
2
113

Nh

nihonium(286)2
8
18
32
18
8
3
114

Fl

Flerovium(289)2
8
18
32
18
8
4
115

Lv

Moscovium(289)2
8
18
32
18
8
5
116

Lv

Livermorium(293)2
8
18
32
18
8
6
117

Ts

tennessine(294)2
8
18
32
18
8
7
118

Og

Oganesson(294)2
8
18
32
18
8
8
57

La

Lanthanum138.9052
8
18
18
9
2
58

Ce

Cerium140.1162
8
18
19
9
2
59

Pr

Praseodymium140.9082
8
18
21
8
2
60

Nd

Neodymium144.2422
8
18
22
8
2
61

Pm

Promethium(145)2
8
18
23
8
2
62

Sm

Samarium150.362
8
18
24
8
2
63

Eu

Europium151.9642
8
18
25
8
2
64

Gd

Gadolinium157.252
8
18
25
9
2
65

Tb

Terbium158.9252
8
18
27
8
2
66

Dy

Dysprosium162.52
8
18
28
8
2
67

Ho

Holmium164.932
8
18
29
8
2
68

Er

Erbium167.2592
8
18
30
8
2
69

Tm

Thulium168.9342
8
18
31
8
2
70

Yb

Ytterbium173.0452
8
18
32
8
2
71

Lu

Lutetium174.9672
8
18
32
9
2
89

Ac

Actinium(227)2
8
18
32
18
9
2
90

Th

Thorium232.0382
8
18
32
18
10
2
91

Pa

Protactinium231.0362
8
18
32
20
9
2
92

U

Uranium238.0292
8
18
32
21
9
2
93

Np

Neptunium(237)2
8
18
32
22
9
2
94

Pu

Plutonium(244)2
8
18
32
24
8
2
95

Am

Americium(243)2
8
18
32
25
8
2
96

Cm

Curium(247)2
8
18
32
25
9
2
97

Bk

Berkelium(247)2
8
18
32
27
8
2
98

Cf

Californium(251)2
8
18
32
28
8
2
99

Es

Einsteinium(252)2
8
18
32
29
8
2
100

Fm

Fermium(257)2
8
18
32
30
8
2
101

Md

Mendelevium(258)2
8
18
32
31
8
2
102

No

Nobelium(259)2
8
18
32
32
9
2
103

Lr

Lawrencium(262)2
8
18
32
32
9
3