What is atomic num
Subject
Topic
Level
Highschool
Grade
10

Answer

  • Each Chemical element on the Periodic table is given a unique Atomic Number - a Periodic Table Number. Atoms are made up of three kinds of smaller particles, called protons, neutrons and electrons.
  • The atomic number is the number of protons in the atom, see Number of Protons and Neutrons. Atoms must have equal numbers of protons and electrons. The chemical elements of the periodic table are listed in order of atomic number.
  • The atomic number of an element is the same as the number of electrons or protons in that particular atom. Across the Periodic table the elements are placed in the order of their atomic numbers starting with the lowest number of 1 which is the atomic number for hydrogen.
  • Every element has a unique Element Symbol and a unique Atomic Number. The same Atomic Number for each element is used all over the world and instantly recognised by scientists and chemists. It is imperative for chemistry students to be able to recognise the names of elements from their Atomic number.

List of Elements and their Atomic Number

Alphabetical List
Atomic Number

 

Numerical List
Atomic Number

Actinium 
Aluminium 
Americium 
Antimony 
Argon 
Arsenic 
Astatine 
Barium 
Berkelium  
Beryllium 
Bismuth 
Bohrium 
Boron 
Bromine
Cadmium 
Cesium 
Calcium 
Californium 
Carbon 
Cerium 
Chlorine 
Chromium 
Cobalt 
Copper 
Curium  
Darmstadtium 
Dubnium 
Dysprosium 
Einsteinium  
Erbium 
Europium 
Fermium 
Fluorine 
Francium 
Gadolinium 
Gallium 
Germanium 
Gold 
Hafnium 
Hassium 
Helium 
Holmium 
Hydrogen 
Indium 
Iodine 
Iridium 
Iron 
Krypton 
Lanthanum 
Lawrencium 
Lead 
Lithium 
Lutetium  
Magnesium 
Manganese 
Meitnerium 
Mendelevium 
Mercury
Molybdenum 
Neodymium 
Neon 
Neptunium 
Nickel  
Niobium 
Nitrogen 
Nobelium 
Osmium 
Oxygen  
Palladium 
Phosphorus 
Platinum 
Plutonium 
Polonium 
Potassium  
Praseodymium 
Promethium 
Protactinium  
Radium  
Radon 
Rhenium 
Rhodium 
Roentgenium 
Rubidium  
Ruthenium 
Rutherfordium 
Samarium  
Scandium 
Seaborgium  
Selenium 
Silicon  
Silver 
Sodium  
Strontium 
Sulfur 
Tantalum 
Technetium 
Tellurium 
Terbium 
Thallium 
Thorium 
Thulium 
Tin 
Titanium 
Tungsten 
Ununbium 
Ununhexium 
Ununoctium 
Ununpentium 
Ununquadium  
Ununseptium 
Ununtrium 
Uranium 
Vanadium 
Xenon  
Ytterbium 
Yttrium 
Zinc 
Zirconium

Ac
Al
Am
Sb
Ar
As
At
Ba
Bk
Be
Bi
Bh
B
Br
Cd
Cs
Ca
Cf
C
Ce
Cl
Cr
Co
Cu 
Cm
Ds
Db
Dy
Es
Er
Eu 
Fm
F
Fr
Gd
Ga
Ge
Au
Hf 
Hs
He
Ho
H
In
I
Ir 
Fe
Kr 
La
Lr 
Pb
Li
Lu
Mg
Mn
Mt 
Md
Hg 
Mo
Nd
Ne
Np
Ni
Nb
N
No
Os
O
Pd  
P
Pt
Pu
Po
K
Pr 
Pm
Pa
Ra
Rn
Re
Rh
Rg
Rb
Ru 
Rf 
Sm 
Sc
Sg
Se 
Si 
Ag
Na
Sr

Ta
Tc 
Te
Tb
Tl
Th
Tm
Sn
Ti

Uub
Uuh
Uuo
Uup
Uuq
Uus
Uut

V
Xe
Yb
Y
Zn
Zr
89 
13 
95 
51
18 
33
85 
56
97 

83
107

35 
48
55
20 
98  

58 
17
24
27 
29 
96
110 
105
66 
99
68 
63
100 

87 
64 
31
32
79 
72
108 

67

49 
53
77  
26 
36  
57 
103
82 
3
71
12 
25
109 
101
80 
42
60 
10
93 
28 
41
7
102 
76 
8
46 
15 
78
94 
84
19  
59
61
91
88 
86
75
45
111
37
44 
104
62
21 
106  
34
14
47
11
38
16 
73 
43
52 
65
81
90
69 
50
22
74 
112 
116
118 
115
114
117
113
92 
23
54 
70 
39
30  
40
 



5




10 
11 
12 
13 
14 
15 
16 
17 
18 
19 
20 
21 
22 
23 
24 
25 
26 
27 
28 
29 
30 
31 
32 
33 
34 
35 
36 
37 
38 
39 
40 
41 
42 
43 
44 
45 
46 
47 
48 
49 
50 
51 
52 
53 
54 
55 
56 
57 
58 
59 
60 
61 
62 
63 
64 
65 
66 
67 
68 
69 
70 
71 
72 
73 
74 
75 
76 
77 
78 
79 
80 
81 
82 
83 
84 
85 
86 
87 
88 
89 
90 
91 
92 
93 
94 
95 
96 
97 
98 
99 
100 
101 
102 
103 
104 
105 
106 
107 
108 
109 
110 
111 
112 
113 
114 
115 
116 
117 
118
Hydrogen 
Helium 
Lithium
Beryllium 
Boron
Carbon
Nitrogen 
Oxygen
Fluorine
Neon
Sodium
Magnesium
Aluminium
Silicon
Phosphorus
Sulfur
Chlorine
Argon 
Potassium
Calcium
Scandium
Titanium
Vanadium
Chromium
Manganese
Iron
Cobalt
Nickel 
Copper
Zinc 
Gallium
Germanium
Arsenic
Selenium
Bromine
Krypton 
Rubidium 
Strontium
Yttrium
Zirconium 
Niobium 
Molybdenum
Technetium
Ruthenium
Rhodium
Palladium
Silver
Cadmium
Indium
Tin
Antimony
Tellurium
Iodine
Xenon
Caesium
Barium
Lanthanum 
Cerium 
Praseodymium 
Neodymium
Promethium
Samarium
Europium
Gadolinium 
Terbium
Dysprosium
Holmium
Erbium
Thulium
Ytterbium
Lutetium
Hafnium
Tantalum
Tungsten
Rhenium
Osmium
Iridium
Platinum
Gold 
Mercury
Thallium
Lead
Bismuth
Polonium
Astatine
Radon
Francium
Radium
Actinium
Thorium
Protactinium
Uranium
Neptunium
Plutonium
Americium 
Curium
Berkelium
Californium
Einsteinium
Fermium
Mendelevium
Nobelium
Lawrencium
Rutherfordium
Dubnium
Seaborgium
Bohrium
Hassium
Meitnerium
Darmstadtium 
Roentgenium
Ununbium
Ununtrium
Ununquadium
Ununpentium
Ununhexium 
Ununseptium
Ununoctium

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