Atomic Number 1 To 20

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Here is a list of the elements sorted by atomic number.Element nameElement symbolAtomic numberHydrogenH1HeliumHe2LithiumLi3. Using this method, students can easily write atomic mass of first 20 elements of the periodic table.For more videos on Physics, Chemistry and Mathematics ref. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. Atomic Number 20. Atomic Number 20 is belong to element of Calcium. Chemical symbol for Calcium is Ca. Number of protons in Calcium is 20. Atomic weight of Calcium is 40.078 u or g/mol.

Get essential facts about the first 20 elements, all in one convenient place, including the name, atomic number, atomic mass, element symbol, group, and electron configuration. If you need detailed facts about these elements or any of the higher numbered ones, start with the clickable periodic table.

The elements of the periodic table sorted by atomic number

click on any elements name for further chemical properties, environmental data or health effects.

This list contains the 118 elements of chemistry.

The chemical elements of
the periodic chart sorted by:
Atomic number

Name chemical element

Symbol
- Name alphabetically1HydrogenH
- Atomic number2HeliumHe
- Symbol3LithiumLi
- Atomic Mass4BerylliumBe
- Electronegativity5BoronB
- Density6CarbonC
- Melting point7NitrogenN
- Boiling point8OxygenO
- Vanderwaals radius9FluorineF
- Year of discovery10NeonNe
- Inventor surname11SodiumNa
- Elements in earthcrust12MagnesiumMg
- Elements in human body13AluminumAl
- Covalenz radius14SiliconSi
- Ionization energy15PhosphorusP

For chemistry students and teachers: The tabular chart on the right is arranged by Atomic number.

The first chemical element is Hydrogen and the last is Ununoctium.

Please note that the elements do not show their natural relation towards each other as in the Periodic system. There you can find the metals, semi-conductor(s), non-metal(s), inert noble gas(ses), Halogens, Lanthanoides, Actinoids (rare earth elements) and transition metals.

16SulfurS
17ChlorineCl
18ArgonAr
19PotassiumK
20CalciumCa
21ScandiumSc
22TitaniumTi
23VanadiumV
24ChromiumCr
25ManganeseMn
26IronFe
27CobaltCo
28NickelNi
29CopperCu
30ZincZn
31GalliumGa
32GermaniumGe
33ArsenicAs
34SeleniumSe
35BromineBr
36KryptonKr
37RubidiumRb
38StrontiumSr
39YttriumY
40ZirconiumZr
41NiobiumNb
42MolybdenumMo
43TechnetiumTc
44RutheniumRu
45RhodiumRh
46PalladiumPd
47SilverAg
48CadmiumCd
49IndiumIn
50TinSn
51AntimonySb
52TelluriumTe
53IodineI
54XenonXe
55CesiumCs
56BariumBa
57LanthanumLa
58CeriumCe
59PraseodymiumPr
60NeodymiumNd
61PromethiumPm
62SamariumSm
63EuropiumEu
64GadoliniumGd
65TerbiumTb
66DysprosiumDy
67HolmiumHo
68ErbiumEr
69ThuliumTm
70YtterbiumYb
71LutetiumLu
72HafniumHf
73TantalumTa
74TungstenW
75RheniumRe
76OsmiumOs
77IridiumIr
78PlatinumPt
79GoldAu
80MercuryHg
81ThalliumTl
82LeadPb
83BismuthBi
84PoloniumPo
85AstatineAt
86RadonRn
87FranciumFr
88RadiumRa
89ActiniumAc
90ThoriumTh
91ProtactiniumPa
92UraniumU
93NeptuniumNp
94PlutoniumPu
95AmericiumAm
96CuriumCm
97BerkeliumBk
98CaliforniumCf
99EinsteiniumEs
100FermiumFm
101MendeleviumMd
102NobeliumNo
103LawrenciumLr
104RutherfordiumRf
105DubniumDb
106SeaborgiumSg
107BohriumBh
108HassiumHs
109MeitneriumMt
110DarmstadtiumDs
111RoentgeniumRg
112CoperniciumCn
113NihoniumNh
114FleroviumFl
115MoscoviumMc
116LivermoriumLv
117TennessineTs
118OganessonOg

Click here: for a schematic overview of the periodic table of elements in chart form

Do you need to know the weight of some molecules? Try our Molecular Weight Calculator!

NumberAtomic

Please report any accidental mistake in the above statistics on chemical elements

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