Atomic Number 34



Atomic

Selenium Selenium is a chemical element with symbol Se and atomic number 34. Classified as a nonmetal, Selenium is a solid at room temperature. Properties: Selenium has an atomic radius of 117 pm, a melting point of 220.5°C, boiling point of 685°C, with oxidation states of 6, 4, and -2. Selenium is a member of the sulfur group of nonmetallic elements and is similar to this element in terms of its forms and compounds. Selenium (Se) is a grey non metal that can also exist as a red allotrope. It has the atomic number 34 in the periodic table. It is located in Group 16 of the periodic table. It has the symbol Se. In periodic table the atomic no of 34 position is selenium IlaMends IlaMends Answer: The element X will be in period-4 and group number 16 that is oxygen family group.

Atomic Number of Selenium is 34.

Chemical symbol for Selenium is Se. Number of protons in Selenium is 34. Atomic weight of Selenium is 78.971 u or g/mol. Melting point of Selenium is 217 °C and its the boiling point is 685 °C.

» Boiling Point» Melting Point» Abundant» State at STP» Discovery Year

About Selenium

This chemical element can be found in two forms: a red color powder or light grey color metal. Selenium has a beautiful name coming after the Greek name for the Moon. This element is vital for living creatures and things, but just in micro doses, and in excess doses it can cause cancer or serious intoxication. Selenium in its pure form can not be found on the surface of our planet, but it exists in some rare minerals and special muds. The most important use of this chemical element is in glass production. It can be also added as catalyst and as electricity convertor in rectifiers.

Properties of Selenium Element

Atomic Number (Z)34
Atomic SymbolSe
Group16
Period4
Atomic Weight78.971 u
Density4.809 g/cm3
Melting Point (K)453 K
Melting Point (℃)217 °C
Boiling Point (K)958 K
Boiling Point (℃)685 °C
Heat Capacity0.321 J/g · K
Abundance0.05 mg/kg
State at STPSolid
OccurrencePrimordial
DescriptionNon-metal
Electronegativity (Pauling) χ2.55
Ionization Energy (eV)9.75238
Atomic Radius115pm
Covalent Radius116pm
Van der Waals Radius190
Valence Electrons6
Year of Discovery1817
DiscovererBerzelius

Atomic Number 34 Symbol

What is the Boiling Point of Selenium?

AtomicNumber

Selenium boiling point is 685 °C. Boiling point of Selenium in Kelvin is 958 K.

What is the Melting Point of Selenium?

Selenium melting point is 217 °C. Melting point of Selenium in Kelvin is 453 K.

How Abundant is Selenium?

Abundant value of Selenium is 0.05 mg/kg.

What is the State of Selenium at Standard Temperature and Pressure (STP)?

State of Selenium is Solid at standard temperature and pressure at 0℃ and one atmosphere pressure.

When was Selenium Discovered?

Selenium was discovered in 1817.


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SEENotes at the bottom of the Table.

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)
Atomic number 34 e.g. crossword

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:

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 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.

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

Atomic Number 34 Valency

Atomic Number 34

Atomic Number 34 Crossword

  • Chemical Evolution of the Universe