Atomic Number of Elements – The Periodic Table

Atomic Number of Elements

The atomic number or proton number (symbol Z) of a chemical element is the number of protons found in the nucleus of an atom. It is identical to the charge number of the nucleus. The atomic number uniquely identifies a chemical element. In an uncharged atom, the atomic number is also equal to the number of electrons.

The sum of the atomic number Z and the number of neutrons, N, gives the mass number A of an atom. Since protons and neutrons have approximately the same mass (and the mass of the electrons is negligible for many purposes) and the mass defect of nucleon binding is always small compared to the nucleon mass, the atomic mass of any atom, when expressed in unified atomic mass units (making a quantity called the “relative isotopic mass”), is within 1% of the whole number A.




As of August 2017, 118 chemical elements are identified. A chemical element or element is a species of atoms having the same number of protons in their atomic nuclei. Therefore, the elements can be listed by the number of protons in the atom of each element as listed below in alphabetic order. You can use the search box below or click on the index to search a particular element. To learn and test your knowledge in periodic table of elements, you may install the “Periodic Table Quiz” app from google play



All | A B C D E F G H I K L M N O P R S T U V X Y Z
There are currently 118 names in this directory
Actinium (Ac)
89

Aluminum (Al)
13

Americium (Am)
95

Antimony (Sb)
51

Argon (Ar)
18

Arsenic (As)
33

Astatine (At)
85

Barium (Ba)
56

Berkelium (Bk)
97

Beryllium (Be)
4

Bismuth (Bi)
83

Bohrium (Bh)
107

Boron (B)
5

Bromine (Br)
35

Cadmium (Cd)
48

Calcium (Ca)
20

Californium (Cf)
98

Carbon (C )
6

Cerium (Ce)
58

Cesium (Cs)
55

Chlorine (Cl)
17

Chromium (Cr)
24

Cobalt (Co)
27

Copernicium (Cn)
112

Copper (Cu)
29

Curium (Cm)
96

Darmstadtium (Ds)
110

Dubnium (Db)
105

Dysprosium (Dy)
66

Einsteinium (Es)
99

Erbium (Er)
68

Europium (Eu)
63

Fermium (Fm)
100

Flerovium (Fl)
114

Fluorine (F)
9

Francium (Fr)
87

Gadolinium (Gd)
64

Gallium (Ga)
31

Germanium (Ge)
32

Gold (Au)
79

Hafnium (Hf)
72

Hassium (Hs)
108

Helium (He)
2

Holmium (Ho)
67

Hydrogen
1

Indium (In)
49

Iodine (I)
53

Iridium (Ir)
77

Iron (Fe)
26

Krypton (Kr)
36

Lanthanum (La)
57

Lawrencium (Lr)
103

Lead (Pb)
82

Lithium (Li)
3

Livermorium (Lv)
116

Lutetium (Lu)
71

Magnesium (Mg)
12

Manganese (Mn)
25

Meitnerium (Mt)
109

Mendelevium (Md)
101

Mercury (Hg)
80

Molybdenum (Mo)
42

Moscovium (Mc)
115

Neodymium (Nd)
60

Neon (Ne)
10

Neptunium (Np)
93

Nickel (Ni)
28

Nihonium (Nh)
113

Niobium (Nb)
41

Nitrogen (N)
7

Nobelium (No)
102

Oganesson (Og)
118

Osmium (Os)
76

Oxygen (O)
8

Palladium (Pd)
46

Phosphorus (P)
15

Platinum (Pt)
78

Plutonium (Pu)
94

Polonium (Po)
84

Potassium (K)
19

Praseodymium (Pr)
59

Promethium (Pm)
61

Protactinium (Pa)
91

Radium (Ra)
88

Radon (Rn)
86

Rhenium (Re)
75

Rhodium (Rh)
45

Roentgenium (Rg)
111

Rubidium (Rb)
37

Ruthenium (Ru)
44

Rutherfordium (Rf)
104

Samarium (Sm)
62

Scandium (Sc)
21

Seaborgium (Sg)
106

Selenium (Se)
34

Silicon(Si)
14

Silver (Ag)
47

Sodium (Na)
11

Strontium (Sr)
38

Sulfur (S)
16

Tantalum (Ta)
73

Technetium (Tc)
43

Tellurium (Te)
52

Tennessine (Ts)
117

Terbium (Tb)
65

Thallium (Tl)
81

Thorium (Th)
90

Thulium (Tm)
69

Tin (Sn)
50

Titanium (Ti)
22

Tungsten (W)
74

Uranium (U)
92

Vanadium (V)
23

Xenon (Xe)
54

Ytterbium (Yb)
70

Yttrium (Y)
39

Zinc (Zn)
30

Zirconium (Zr)
40


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