Selenium

element 34 of routine table is Selenium through atomic number 34, atomic weight 78.96. Selenium, prize Se, has actually a an easy Monoclinic structure and also Gray color. Selenium is a other nonmetal element. Trivial surname of Selenium is chalcogens*. Recognize everything about Selenium Facts, physical Properties, chemical Properties, electronic configuration, Atomic and Crystal Structure.


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Selenium is a chemical facet with price Se and also atomic number 34. The is a nonmetal v properties that space intermediate between those that its periodic table column-adjacent chalcogen aspects sulfur and tellurium. It seldom occurs in its element state in nature, or as pure ore compounds.

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Selenium Facts

Read key information and facts about element Selenium

surname Selenium
atomic Number 34
atom Symbol Se
Atomic load 78.96
phase Solid
shade Gray
Classification other nonmetal
group in periodic Table 16
Group Name oxygen household
period in routine Table 4
Block in periodic Table p-block
Electronic Configuration 3d10 4s2 4p4
Melting point 221 °C
Boiling allude 685 °C
Electronic covering Structure <2, 8, 18, 6>
CAS Number CAS7782-49-2

ar
15
P
16
S
17
Cl
33
As
34
Se
35
Br
51
Sb
52
Te
53
I
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
1
1
H
2
He
2
3
Li
4
Be
5
B
6
C
7
N
8
O
9
F
10
Ne
3
11
Na
12
Mg
13
Al
14
Si
15
P
16
S
17
Cl
18
Ar
4
19
K
20
Ca
21
Sc
22
Ti
23
V
24
Cr
25
Mn
26
Fe
27
Co
28
Ni
29
Cu
30
Zn
31
Ga
32
Ge
33
As
34
Se
35
Br
36
Kr
5
37
Rb
38
Sr
39
Y
40
Zr
41
Nb
42
Mo
43
Tc
44
Ru
45
Rh
46
Pd
47
Ag
48
Cd
49
In
50
Sn
51
Sb
52
Te
53
I
54
Xe
6
55
Cs
56
Ba
72
Hf
73
Ta
74
W
75
Re
76
Os
77
Ir
78
Pt
79
Au
80
Hg
81
Tl
82
Pb
83
Bi
84
Po
85
At
86
Rn
7
87
Fr
88
Ra
104
Rf
105
Db
106
Sg
107
Bh
108
Hs
109
Mt
110
Ds
111
Rg
112
Cn
113
Nh
114
Fl
115
Mc
116
Lv
117
Ts
118
Og
Lanthanides
57
La
58
Ce
59
Pr
60
Nd
61
Pm
62
Sm
63
Eu
64
Gd
65
Tb
66
Dy
67
Ho
68
Er
69
Tm
70
Yb
71
Lu
Actinide
89
Ac
90
Th
91
Pa
92
U
93
Np
94
Pu
95
Am
96
Cm
97
Bk
98
Cf
99
Es
100
Fm
101
Md
102
No
103
Lr

discover our interactive periodic table


How to locate Selenium on regular Table

Periodic table is arranged by atom number, variety of protons in the nucleus i m sorry is exact same as number of electrons. The atom number boosts from left to right. Routine table beginning at peak left ( atom number 1) and also ends in ~ bottom right (atomic number 118). Because of this you can straight look for atomic number 34 to find Selenium on routine table.

Another means to read routine table and locate an facet is by using team number (column) and period number (row). To find Selenium on periodic table look for cross ar of team 16 and period 4 in the modern-day periodic table.

check out Interactive routine Table to Understand and also Learn Cool trends

Table of Contents


History
Abundance
Physical Properties
Thermal Properties
Crystal Structure
Atomic & orbital Properties
Chemical Properties
Isotopes
Health and Safety Parameters and Guidelines
Databases
Compare Selenium with various other elements

Selenium History

The aspect Selenium was uncovered by Jöns Jakob Berzelius in year 1817 in Sweden . Selenium obtained its name from the Greek selene, meaning "moon"

Selenium Presence: diversity in Nature and also Around Us

The table listed below shows the diversity of Selenium in Universe, Sun, Meteorites, Earth"s Crust, Oceans and Human Body.

Ppb by weight (1ppb =10^-7 %)
variety in universe 3×10-6%
diversity in sun N/A
abundance in Meteorites 1.3e-05
Abundance in Earth"s tardy 5×10-6%
variety in oceans 4.5×10-8%
abundance in people 5×10-6%

Crystal structure of Selenium

The heavy state framework of Selenium is Simple Monoclinic.

The decision structure can be defined in terms of its unit Cell. The unit cells repeats chin in three dimensional room to kind the structure.

Unit cabinet Parameters

The unit cell is represented in terms of its lattice parameters, which room the lengths of the cell edges Lattice Constants (a, b and also c)

a b c
905.4 908.3 1160.1 pm

and the angles in between them Lattice angles (alpha, beta and gamma).

alpha beta gamma
π/2 1.58493 π/2

The positions of the atoms within the unit cabinet are described by the set of atom positions ( xi, yi, zi) measured indigenous a reference lattice point.

The symmetry nature of the crystal are defined by the ide of room groups. All possible symmetric arrangements of corpuscle in three-dimensional an are are described by the 230 room groups (219 unique types, or 230 if chiral duplicates are considered distinct.

space Group surname P121/c1
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an are Group Number 14
Crystal framework Simple Monoclinic

Selenium Atomic and also Orbital Properties

Selenium atoms have actually 34 electrons and also the electronic shell structure is <2, 8, 18, 6> with Atomic term Symbol (Quantum Numbers) 3P2.


atom Number 34
Number of electrons (with no charge) 34
Number that Protons 34
Mass Number 79
Number that Neutrons 45
Shell framework (Electrons per energy level) <2, 8, 18, 6>
Electron configuration 3d10 4s2 4p4
Valence Electrons 4s2 4p4
Oxidation State -2;-1 1;2;3;4;5;6
Atomic term Symbol (Quantum Numbers) 3P2

Shell framework of Selenium - electron per energy level


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Ground State electronic Configuration that Selenium - neutral Selenium atom

The ground state electronic configuration the Neutral Selenium atom is 3d10 4s2 4p4. The part of Selenium configuration that is identical to the noble gas the the coming before period, is abbreviated as . Because that atoms with numerous electrons, this notation can become prolonged and so an abbreviated notation is used.This is crucial as the is the Valence electrons 3d10 4s2 4p4, electrons in the outermost shell that determine the chemical properties of the element.

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Unabbreviated electronic configuration the neutral Selenium

Complete floor state electronic configuration for the Selenium atom, Unabbreviated digital configuration

1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4

Atomic structure of Selenium

Selenium atomic radius is 103 pm, when it"s covalent radius is 116 pm.

atom Radius

103 pm (1.03 Å)

Atomic Volume 16.3851421457 cm3
Covalent Radius 116 pm (1.16 Å)
van der Waals Radius 190 pm
spirit Cross section 11.7 σa/barns

Atomic Spectrum that Selenium

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Selenium chemical Properties: Selenium Ionization Energies and electron affinity

The electron affinity the Selenium is 195 kJ/mol

Valence 6
Electronegativity 2.55
ElectronAffinity 195 kJ/mol

Ionization energy of Selenium

Refer come table below for Ionization energies of Selenium

Ionization energy number Enthalpy - kJ/mol
1 941
2 2045
3 2973.7
4 4144
5 6590
6 7880
7 14990

Selenium physics Properties

Refer to below table because that Selenium physical Properties

thickness 4.819 g/cm3
Molar Volume 16.3851421457 cm3

Elastic Properties

Young Modulus 10 GPa
Shear Modulus 3.7 GPa
mass Modulus 8.3 GPa
Poisson ratio 0.33

Hardness the Selenium - test to measure up of Hardness that Element

Mohs Hardness 2 MPa
Vickers Hardness N/A
Brinell Hardness 736 MPa

Selenium electric Properties

Selenium is N/A of electricity. Refer to table below for the electric properties of Selenium

electric Conductivity N/A
Resistivity N/A
Superconducting allude N/A

Selenium Heat and Conduction Properties

thermal Conductivity 0.52 W/(m K)
Thermal growth N/A

Selenium Magnetic Properties

Magnetic kind Diamagnetic
Curie suggest N/A
massive Magnetic Susceptibility -4×10-9
Molar Magnetic Susceptibility -3.16×10-10
Volume Magnetic Susceptibility -1.93e-05

Optical properties of Selenium

Refractive index 1.000895

Acoustic nature of Selenium

speed of Sound 3350 m/s

Selenium heat Properties - Enthalpies and also thermodynamics

Refer come table listed below for thermal properties the Selenium

Melting suggest 494 K (221 °C)
Boiling suggest 958 K (685 °C)
an important Temperature 1766 K
Superconducting suggest N/A

Enthalpies the Selenium

warmth of blend 5.4 kJ/mol
warmth of Vaporization 26 kJ/mol
warm of combustion "N/A", "N/A", "N/A" J/(kg K)

Selenium isotope - atom Properties of Selenium

Isotopes that rhodium. Naturally emerging Selenium has 5 steady isotope - 74Se, 76Se, 77Se, 78Se, 80Se.


Isotope Isotope fixed % diversity T half Decay mode
65Se
66Se
67Se
68Se
69Se
70Se
71Se
72Se
73Se
74Se 0.89% steady N/A
75Se
76Se 9.37% stable N/A
77Se 7.63% stable N/A
78Se 23.77% secure N/A
79Se
80Se 49.61% steady N/A
81Se
82Se 8.73%
83Se
84Se
85Se
86Se
87Se
88Se
89Se
90Se
91Se
92Se
93Se
94Se

Regulatory and also Health - Health and also Safety Parameters and also Guidelines

CAS Number CAS7782-49-2
RTECS Number N/A, RTECSVS7700000, N/A
dot Hazard class N/A, 6.1, N/A
period Numbers "N/A", 2658, "N/A"
EU Number N/A, N/A, N/A
NFPA Fire Rating N/A, 0, N/A
NFPA dangers N/ A, N/ A, N/ A
NFPA health Rating N/A, 2, N/A
NFPA Reactivity Rating N/A, 0, N/A
Autoignition point N/A
Flashpoint N/A

Database Search

list of distinctive identifiers to search the aspect in various chemical it is registered databases

Database identifier number
CAS Number - chemical Abstracts business (CAS) CAS7782-49-2
CID Number CID6326970, CID6326970, CID139346
Gmelin Number N/A, N/A, N/A
NSC Number N/A, N/A, N/A
RTECS Number N/A, RTECSVS7700000, N/A

Compare Selenium through all Group 16 elements

Selenium vs Oxygen Selenium vs Sulfur Selenium vs Tellurium Selenium vs Polonium Selenium vs Livermorium

Compare Selenium with all other nonmetal elements

Selenium vs Hydrogen Selenium vs Carbon Selenium vs Nitrogen Selenium vs Oxygen Selenium vs Phosphorus Selenium vs Sulfur