Atomic Number Of Elements From 1 To 30



  1. Atomic Number Of Elements From 1 To 300
  2. Atomic Number Of Elements From 1 To 30 Chart
Atomic Number Of Elements From 1 To 30

Click a column header, such as Name, to sort the table by that item.
SEENotes at the bottom of the Table.

Elements

Standard atomic weight is used to give the value of the mean of the atomic masses in a mixture of isotopes in a given sample of an element. Atomic Mass of First 30 Elements. Given below is a table that lists the first 30 elements based on atomic number and their corresponding atomic mass.

Atomic number of elements from 1 to 30 pdf
No.
Atomic
weight
NameSym.M.P.
(°C)
B.P.
(°C)
Density*
(g/cm3)
Earth
crust (%)*
Discovery
(Year)
Group*Electron configurationIonization
energy (eV)
11.008HydrogenH-259-2530.090.14177611s113.60
24.003HeliumHe-272-2690.181895181s224.59
36.941LithiumLi1801,3470.5318171[He] 2s15.39
49.012BerylliumBe1,2782,9701.8517972[He] 2s29.32
510.811BoronB2,3002,5502.34180813[He] 2s2 2p18.30
612.011CarbonC3,5004,8272.260.09ancient14[He] 2s2 2p211.26
714.007NitrogenN-210-1961.25177215[He] 2s2 2p314.53
815.999OxygenO-218-1831.4346.71177416[He] 2s2 2p413.62
918.998FluorineF-220-1881.700.03188617[He] 2s2 2p517.42
1020.180NeonNe-249-2460.90189818[He] 2s2 2p621.56
1122.990SodiumNa988830.972.7518071[Ne] 3s15.14
1224.305MagnesiumMg6391,0901.742.0817552[Ne] 3s27.65
1326.982AluminumAl6602,4672.708.07182513[Ne] 3s2 3p15.99
1428.086SiliconSi1,4102,3552.3327.69182414[Ne] 3s2 3p28.15
1530.974PhosphorusP442801.820.13166915[Ne] 3s2 3p310.49
1632.065SulfurS1134452.070.05ancient16[Ne] 3s2 3p410.36
1735.453ChlorineCl-101-353.210.05177417[Ne] 3s2 3p512.97
1839.948ArgonAr-189-1861.78189418[Ne] 3s2 3p615.76
1939.098PotassiumK647740.862.5818071[Ar] 4s14.34
2040.078CalciumCa8391,4841.553.6518082[Ar] 4s26.11
2144.956ScandiumSc1,5392,8322.9918793[Ar] 3d1 4s26.56
2247.867TitaniumTi1,6603,2874.540.6217914[Ar] 3d2 4s26.83
2350.942VanadiumV1,8903,3806.1118305[Ar] 3d3 4s26.75
2451.996ChromiumCr1,8572,6727.190.0417976[Ar] 3d5 4s16.77
2554.938ManganeseMn1,2451,9627.430.0917747[Ar] 3d5 4s27.43
2655.845IronFe1,5352,7507.875.05ancient8[Ar] 3d6 4s27.90
2758.933CobaltCo1,4952,8708.9017359[Ar] 3d7 4s27.88
2858.693NickelNi1,4532,7328.900.02175110[Ar] 3d8 4s27.64
2963.546CopperCu1,0832,5678.96ancient11[Ar] 3d10 4s17.73
3065.390ZincZn4209077.13ancient12[Ar] 3d10 4s29.39
3169.723GalliumGa302,4035.91187513[Ar] 3d10 4s2 4p16.00
3272.640GermaniumGe9372,8305.32188614[Ar] 3d10 4s2 4p27.90
3374.922ArsenicAs816135.72ancient15[Ar] 3d10 4s2 4p39.79
3478.960SeleniumSe2176854.79181716[Ar] 3d10 4s2 4p49.75
3579.904BromineBr-7593.12182617[Ar] 3d10 4s2 4p511.81
3683.800KryptonKr-157-1533.75189818[Ar] 3d10 4s2 4p614.00
3785.468RubidiumRb396881.6318611[Kr] 5s14.18
3887.620StrontiumSr7691,3842.5417902[Kr] 5s25.69
3988.906YttriumY1,5233,3374.4717943[Kr] 4d1 5s26.22
4091.224ZirconiumZr1,8524,3776.510.0317894[Kr] 4d2 5s26.63
4192.906NiobiumNb2,4684,9278.5718015[Kr] 4d4 5s16.76
4295.940MolybdenumMo2,6174,61210.2217816[Kr] 4d5 5s17.09
43*98.000TechnetiumTc2,2004,87711.5019377[Kr] 4d5 5s27.28
44101.070RutheniumRu2,2503,90012.3718448[Kr] 4d7 5s17.36
45102.906RhodiumRh1,9663,72712.4118039[Kr] 4d8 5s17.46
46106.420PalladiumPd1,5522,92712.02180310[Kr] 4d108.34
47107.868SilverAg9622,21210.50ancient11[Kr] 4d10 5s17.58
48112.411CadmiumCd3217658.65181712[Kr] 4d10 5s28.99
49114.818IndiumIn1572,0007.31186313[Kr] 4d10 5s2 5p15.79
50118.710TinSn2322,2707.31ancient14[Kr] 4d10 5s2 5p27.34
51121.760AntimonySb6301,7506.68ancient15[Kr] 4d10 5s2 5p38.61
52127.600TelluriumTe4499906.24178316[Kr] 4d10 5s2 5p49.01
53126.905IodineI1141844.93181117[Kr] 4d10 5s2 5p510.45
54131.293XenonXe-112-1085.90189818[Kr] 4d10 5s2 5p612.13
55132.906CesiumCs296781.8718601[Xe] 6s13.89
56137.327BariumBa7251,1403.590.0518082[Xe] 6s25.21
57138.906LanthanumLa9203,4696.1518393[Xe] 5d1 6s25.58
58140.116CeriumCe7953,2576.771803101[Xe] 4f1 5d1 6s25.54
59140.908PraseodymiumPr9353,1276.771885101[Xe] 4f3 6s25.47
60144.240NeodymiumNd1,0103,1277.011885101[Xe] 4f4 6s25.53
61*145.000PromethiumPm1,1003,0007.301945101[Xe] 4f5 6s25.58
62150.360SamariumSm1,0721,9007.521879101[Xe] 4f6 6s25.64
63151.964EuropiumEu8221,5975.241901101[Xe] 4f7 6s25.67
64157.250GadoliniumGd1,3113,2337.901880101[Xe] 4f7 5d1 6s26.15
65158.925TerbiumTb1,3603,0418.231843101[Xe] 4f9 6s25.86
66162.500DysprosiumDy1,4122,5628.551886101[Xe] 4f10 6s25.94
67164.930HolmiumHo1,4702,7208.801867101[Xe] 4f11 6s26.02
68167.259ErbiumEr1,5222,5109.071842101[Xe] 4f12 6s26.11
69168.934ThuliumTm1,5451,7279.321879101[Xe] 4f13 6s26.18
70173.040YtterbiumYb8241,4666.901878101[Xe] 4f14 6s26.25
71174.967LutetiumLu1,6563,3159.841907101[Xe] 4f14 5d1 6s25.43
72178.490HafniumHf2,1505,40013.3119234[Xe] 4f14 5d2 6s26.83
73180.948TantalumTa2,9965,42516.6518025[Xe] 4f14 5d3 6s27.55
74183.840TungstenW3,4105,66019.3517836[Xe] 4f14 5d4 6s27.86
75186.207RheniumRe3,1805,62721.0419257[Xe] 4f14 5d5 6s27.83
76190.230OsmiumOs3,0455,02722.6018038[Xe] 4f14 5d6 6s28.44
77192.217IridiumIr2,4104,52722.4018039[Xe] 4f14 5d7 6s28.97
78195.078PlatinumPt1,7723,82721.45173510[Xe] 4f14 5d9 6s18.96
79196.967GoldAu1,0642,80719.32ancient11[Xe] 4f14 5d10 6s19.23
80200.590MercuryHg-3935713.55ancient12[Xe] 4f14 5d10 6s210.44
81204.383ThalliumTl3031,45711.85186113[Xe] 4f14 5d10 6s2 6p16.11
82207.200LeadPb3271,74011.35ancient14[Xe] 4f14 5d10 6s2 6p27.42
83208.980BismuthBi2711,5609.75ancient15[Xe] 4f14 5d10 6s2 6p37.29
84*209.000PoloniumPo2549629.30189816[Xe] 4f14 5d10 6s2 6p48.42
85*210.000AstatineAt3023370.00194017[Xe] 4f14 5d10 6s2 6p59.30
86*222.000RadonRn-71-629.73190018[Xe] 4f14 5d10 6s2 6p610.75
87*223.000FranciumFr276770.0019391[Rn] 7s14.07
88*226.000RadiumRa7001,7375.5018982[Rn] 7s25.28
89*227.000ActiniumAc1,0503,20010.0718993[Rn] 6d1 7s25.17
90232.038ThoriumTh1,7504,79011.721829102[Rn] 6d2 7s26.31
91231.036ProtactiniumPa1,568015.401913102[Rn] 5f2 6d1 7s25.89
92238.029UraniumU1,1323,81818.951789102[Rn] 5f3 6d1 7s26.19
93*237.000NeptuniumNp6403,90220.201940102[Rn] 5f4 6d1 7s26.27
94*244.000PlutoniumPu6403,23519.841940102[Rn] 5f6 7s26.03
95*243.000AmericiumAm9942,60713.671944102[Rn] 5f7 7s25.97
96*247.000CuriumCm1,340013.5019441025.99
97*247.000BerkeliumBk986014.7819491026.20
98*251.000CaliforniumCf900015.1019501026.28
99*252.000EinsteiniumEs86000.0019521026.42
100*257.000FermiumFm1,52700.0019521026.50
101*258.000MendeleviumMd000.0019551026.58
102*259.000NobeliumNo82700.0019581026.65
103*262.000LawrenciumLr1,62700.0019611024.90
104*261.000RutherfordiumRf000.00196440.00
105*262.000DubniumDb000.00196750.00
106*266.000SeaborgiumSg000.00197460.00
107*264.000BohriumBh000.00198170.00
108*277.000HassiumHs000.00198480.00
109*268.000MeitneriumMt000.00198290.00
No.
Atomic
weight
NameSym.M.P.
(°C)
B.P.
(°C)
Density*
(g/cm3)
Earth crust
(%)*
Discovery
(Year)
Group*Electron configurationIonization
energy (eV)

Notes:
• Density of elements with boiling points below 0°C is given in g/l. In a sorted list, these elements are shown before other elements that have boiling points >0°C.
• Earth crust composition average values are from a report by F. W. Clarke and H. S. Washington, 1924. Elemental composition of crustal rocks differ between different localities (see article).
Group: There are only 18 groups in the periodic table that constitute the columns of the table. Lanthanoids and Actinoids are numbered as 101 and 102 to separate them in sorting by group.
• The elements marked with an asterisk (in the 2nd column) have no stable nuclides. For these elements the weight value shown represents the mass number of the longest-lived isotope of the element.

Abbreviations and Definitions:

Electronic Configuration of First 30 Elements with Atomic Numbers (Table) Cr and Cu act as exceptions. Their electronic configuration has half and fully filled atomic orbitals i.e. 3d54s1 and 3d104s1 respectively which are more stable than partially filled orbitals such as 3d44s2 or 3d94s2. This is a list of the 118 chemical elements which have been identified as of 2021. A chemical element, often simply called an element, is a species of atoms which all have the same number of protons in their atomic nuclei (i.e., the same atomic number, or Z). Also, knowing the atomic number of an element can give us an idea about the position of the element in the Periodic Table. Atomic number of an element never changes: for example, the atomic number of oxygen is always 8, and the atomic number of Chlorine is always 18. The atomic number is marked with the symbol Z, taken from a German word zahl.

No. - Atomic Number; M.P. - melting point; B.P. - boiling point

Atomic number: The number of protons in an atom. Each element is uniquely defined by its atomic number.

Atomic mass: The mass of an atom is primarily determined by the number of protons and neutrons in its nucleus. Atomic mass is measured in Atomic Mass Units (amu) which are scaled relative to carbon, 12C, that is taken as a standard element with an atomic mass of 12. This isotope of carbon has 6 protons and 6 neutrons. Thus, each proton and neutron has a mass of about 1 amu.

Isotope: Atoms of the same element with the same atomic number, but different number of neutrons. Isotope of an element is defined by the sum of the number of protons and neutrons in its nucleus. Elements have more than one isotope with varying numbers of neutrons. For example, there are two common isotopes of carbon, 12C and 13C which have 6 and 7 neutrons respectively. The abundances of different isotopes of elements vary in nature depending on the source of materials. For relative abundances of isotopes in nature see reference on Atomic Weights and Isotopic Compositions.

Atomic Number Of Elements From 1 To 300

Atomic weight: Atomic weight values represent weighted average of the masses of all naturally occurring isotopes of an element. The values shown here are based on the IUPAC Commission determinations (Pure Appl. Chem. 73:667-683, 2001). The elements marked with an asterisk have no stable nuclides. For these elements the weight value shown represents the mass number of the longest-lived isotope of the element.

Electron configuration: See next page for explanation of electron configuration of atoms.

Number

Ionization energy (IE): The energy required to remove the outermost electron from an atom or a positive ion in its ground level. The table lists only the first IE in eV units. To convert to kJ/mol multiply by 96.4869. Reference: NIST Reference Table on Ground states and ionization energies for the neutral atoms. IE decreases going down a column of the periodic table, and increases from left to right in a row. Thus, alkali metals have the lowest IE in a period and Rare gases have the highest.

Other resources related to the Periodic Table

  • Chemical Evolution of the Universe

Atomic Number Of Elements From 1 To 30 Chart

Here is a list of the elements sorted by atomic number.

Element nameElement symbolAtomic number
HydrogenH1
HeliumHe2
LithiumLi3
BerylliumBe4
BoronB5
CarbonC6
NitrogenN7
OxygenO8
FluorineF9
NeonNe10
SodiumNa11
MagnesiumMg12
AluminiumAl13
SiliconSi14
PhosphorusP15
SulfurS16
ChlorineCl17
ArgonAr18
PotassiumK19
CalciumCa20
ScandiumSc21
TitaniumTi22
VanadiumV23
ChromiumCr24
ManganeseMn25
IronFe26
CobaltCo27
NickelNi28
CopperCu29
ZincZn30
GalliumGa31
GermaniumGe32
ArsenicAs33
SeleniumSe34
BromineBr35
KryptonKr36
RubidiumRb37
StrontiumSr38
YttriumY39
ZirconiumZr40
NiobiumNb41
MolybdenumMo42
TechnetiumTc43
RutheniumRu44
RhodiumRh45
PalladiumPd46
SilverAg47
CadmiumCd48
IndiumIn49
TinSn50
AntimonySb51
TelluriumTe52
IodineI53
XenonXe54
CaesiumCs55
BariumBa56
LanthanumLa57
CeriumCe58
PraseodymiumPr59
NeodymiumNd60
PromethiumPm61
SamariumSm62
EuropiumEu63
GadoliniumGd64
TerbiumTb65
DysprosiumDy66
HolmiumHo67
ErbiumEr68
ThuliumTm69
YtterbiumYb70
LutetiumLu71
HafniumHf72
TantalumTa73
TungstenW74
RheniumRe75
OsmiumOs76
IridiumIr77
PlatinumPt78
GoldAu79
MercuryHg80
ThalliumTl81
LeadPb82
BismuthBi83
PoloniumPo84
AstatineAt85
RadonRn86
FranciumFr87
RadiumRa88
ActiniumAc89
ThoriumTh90
ProtactiniumPa91
UraniumU92
NeptuniumNp93
PlutoniumPu94
AmericiumAm95
CuriumCm96
BerkeliumBk97
CaliforniumCf98
EinsteiniumEs99
FermiumFm100
MendeleviumMd101
NobeliumNo102
LawrenciumLr103
RutherfordiumRf104
DubniumDb105
SeaborgiumSg106
BohriumBh107
HassiumHs108
MeitneriumMt109
DarmstadtiumDs110
RoentgeniumRg111
CoperniciumCn112
UnuntriumUut113
FleroviumFl114
UnunpentiumUup115
LivermoriumLv116
UnunseptiumUus117
UnunoctiumUuo118