Periodic Table of Elements


The periodic table is the tabular arrangement of all the chemical elements on the basis of their respective atomic numbers. In the periodic table, the vertical columns are called ‘groups’ and the horizontal rows are called ‘periods’. The modern periodic table is based on the modern periodic law put forward by the English physicist Henry Moseley, which states that “the properties of elements are periodic functions of their atomic numbers”. Periodic trends in the properties of the elements can be observed down the groups and across the periods of the modern periodic table.

Every chemical element has a specific atomic number, which provides insight into the number of protons present within its nucleus. All isotopes of an element fall under a single cell on the periodic table, since they all share the same atomic number.

Periodic Table of Elements

Periodic Table of Elements – Atomic Number, Atomic Mass, Groups & Symbols

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List of Chemical Elements 

The table below consists of 118 elements of the periodic table, sorted by atomic number, atomic weight, symbols, density, discovered year and the group.

Atomic NumberAtomic MassChemical Element NameSymbolDiscovery (Year)Group
11.0079HydrogenH17761
24.0026HeliumHe189518
36.941LithiumLi18171
49.0122BerylliumBe17972
510.811BoronB180813
612.0107CarbonCAncient14
714.0067NitrogenN177215
815.9994OxygenO177416
918.9984FluorineF188617
1020.1797NeonNe189818
1122.9897SodiumNa18071
1224.305MagnesiumMg17552
1326.9815AluminumAl182513
1428.0855SiliconSi182414
1530.9738PhosphorusP166915
1632.065SulfurSAncient16
1735.453ChlorineCl177417
1839.948ArgonAr189418
1939.0983PotassiumK18071
2040.078CalciumCa18082
2144.9559ScandiumSc18793
2247.867TitaniumTi17914
2350.9415VanadiumV18305
2451.9961ChromiumCr17976
2554.938ManganeseMn17747
2655.845IronFeAncient8
2758.9332CobaltCo17359
2858.6934NickelNi175110
2963.546CopperCuAncient11
3065.39ZincZnAncient12
3169.723GalliumGa187513
3272.64GermaniumGe188614
3374.9216ArsenicAsAncient15
3478.96SeleniumSe181716
3579.904BromineBr182617
3683.8KryptonKr189818
3785.4678RubidiumRb18611
3887.62StrontiumSr17902
3988.9059YttriumY17943
4091.224ZirconiumZr17894
4192.9064NiobiumNb18015
4295.94MolybdenumMo17816
4398TechnetiumTc19377
44101.07RutheniumRu18448
45102.9055RhodiumRh18039
46106.42PalladiumPd180310
47107.8682SilverAgAncient11
48112.411CadmiumCd181712
49114.818IndiumIn186313
50118.71TinSnAncient14
51121.76AntimonySbAncient15
52127.6TelluriumTe178316
53126.9045IodineI181117
54131.293XenonXe189818
55132.9055CesiumCs18601
56137.327BariumBa18082
57138.9055LanthanumLa18393
58140.116CeriumCe1803101
59140.9077PraseodymiumPr1885101
60144.24NeodymiumNd1885101
61145PromethiumPm1945101
62150.36SamariumSm1879101
63151.964EuropiumEu1901101
64157.25GadoliniumGd1880101
65158.9253TerbiumTb1843101
66162.5DysprosiumDy1886101
67164.9303HolmiumHo1867101
68167.259ErbiumEr1842101
69168.9342ThuliumTm1879101
70173.04YtterbiumYb1878101
71174.967LutetiumLu1907101
72178.49HafniumHf19234
73180.9479TantalumTa18025
74183.84TungstenW17836
75186.207RheniumRe19257
76190.23OsmiumOs18038
77196.9665IridiumIrAncient11
78192.217PlatinumPt18039
79195.078GoldAu173510
80200.59MercuryHgAncient12
81204.3833ThalliumTl186113
82207.2LeadPbAncient14
83208.9804BismuthBiAncient15
84209PoloniumPo189816
85210AstatineAt194017
86222RadonRn190018
87223FranciumFr19391
88226RadiumRa18982
89227ActiniumAc18993
90232.0381ThoriumTh1829102
91231.0359ProtactiniumPa1913102
92238.0289UraniumU1789102
93237NeptuniumNp1940102
94244PlutoniumPu1940102
95243AmericiumAm1944102
96247CuriumCm1944102
97247BerkeliumBk1949102
98251CaliforniumCf1950102
99252EinsteiniumEs1952102
100257FermiumFm1952102
101258MendeleviumMd1955102
102259NobeliumNo1958102
103262LawrenciumLr1961102
104261RutherfordiumRf19644
105262DubniumDb19675
106266SeaborgiumSg19746
107264BohriumBh19817
108277HassiumHs19848
109268MeitneriumMt19829
110261.9DarmstadtiumDs199410
111271.8RoentgeniumRg199411
112285CoperniciumCn199612
113286UnuntriumUut200313
114289FleroviumFl199814
115288UnunpentiumUup201015
116293LivermoriumLv200016
117260.9UnunseptiumUus201017
118294UnunoctiumUuo200618

Related Videos

Atomic Number of Elements

There are about ninety elements found on Earth. Each one has a different number of protons, electrons and neutrons. The total number these subatomic particles held by the respective elements are responsible for their unique properties (including radioactivity).
The number of protons in the nucleus is called the atomic number. The atomic number of each element is unique. The combined number of protons and neutrons in an atom is called the atomic mass number. While the atomic number always stays the same some elements have atoms with different atomic mass numbers. This is because some elements have a different number of neutrons in the nucleus. Versions of an element with different atomic mass numbers are called isotopes.

Frequently Asked Questions – FAQs

What is atomic number?

The atomic number of an element is equal to the total number of protons in the nucleus of the atoms of that element. The atomic number can provide insight into the electronic configuration of the element. For example, carbon has an electron configuration of [He] 2s2 2p2, since its atomic number is 6.

What is the atomic number and mass number?

The number of protons and the number of neutrons shall determine the mass number of an element. Since the isotopes of an element have slightly different mass numbers, it calculates the atomic mass by obtaining the mean of the mass numbers for its isotopes.

Can two different elements have the same atomic number?

Atoms from two different elements may have the same neutron count, but never the same proton count. The number of protons is unique to the element and it represents the number of atoms.

How do we calculate atomic mass?

Add the mass of protons and neutrons to compute the atomic mass of a single atom of an element. Example: Find the atomic mass of a carbon isotope which has 7 neutrons. From the periodic table you can see that carbon has an atomic number of 6, which is its proton number.

Why is atomic number important?

Atomic number is called the number of protons in an atom. This number is very important, because it is unique to a given element’s atoms. An element’s atoms all have the same number of protons and each element has a different number of protons in its atoms.