Selenium

facet 34 of routine table is Selenium v atomic number 34, atomic weight 78.96. Selenium, prize Se, has actually a an easy Monoclinic structure and Gray color. Selenium is a various other nonmetal element. Trivial surname of Selenium is chalcogens*. Understand everything about Selenium Facts, physics Properties, chemical Properties, digital configuration, Atomic and Crystal Structure.


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

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Selenium Facts

Read vital information and also facts around element Selenium

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

neighborhood
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 routine table


How to find Selenium on regular Table

Periodic table is arranged by atom number, number of protons in the nucleus i m sorry is same as variety of electrons. The atomic number increases from left come right. Periodic table start at top left ( atom number 1) and ends in ~ bottom right (atomic number 118). Because of this you can straight look for atomic number 34 to uncover Selenium on periodic table.

Another means to read routine table and also locate an facet is by using team number (column) and period number (row). To locate Selenium on periodic table look because that cross section of group 16 and period 4 in the modern periodic table.

discover Interactive periodic Table come Understand and also Learn Cool patterns

Table that Contents


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

Selenium History

The element Selenium was found by Jöns Jakob Berzelius in year 1817 in Sweden . Selenium acquired its name from the Greek selene, definition "moon"

Selenium Presence: abundance in Nature and Around Us

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

Ppb by weight (1ppb =10^-7 %)
diversity in cosmos 3×10-6%
abundance in sunlight N/A
variety in Meteorites 1.3e-05
Abundance in Earth"s late 5×10-6%
variety in seas 4.5×10-8%
diversity in humans 5×10-6%

Crystal framework of Selenium

The heavy state structure of Selenium is Simple Monoclinic.

The crystal structure deserve to be explained in terms of its unit Cell. The unit cell repeats itself in 3 dimensional space to form the structure.

Unit cabinet Parameters

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

a b c
905.4 908.3 1160.1 pm

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

alpha beta gamma
π/2 1.58493 π/2

The positions of the atoms inside the unit cabinet are explained by the collection of atomic positions ( xi, yi, zi) measured from a recommendation lattice point.

The symmetry properties of the crystal are described by the principle of space groups. All possible symmetric species of particles in three-dimensional an are are described by the 230 room groups (219 unique types, or 230 if chiral copies are thought about distinct.

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

Selenium Atomic and also Orbital Properties

Selenium atoms have 34 electrons and also the digital shell framework is <2, 8, 18, 6> v Atomic term Symbol (Quantum Numbers) 3P2.


atom Number 34
Number of electron (with no charge) 34
Number the 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 hatchet Symbol (Quantum Numbers) 3P2

Shell framework of Selenium - electron per power level


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Ground State electronic Configuration of Selenium - neutral Selenium atom

The soil state electronic configuration of Neutral Selenium atom is 3d10 4s2 4p4. The part of Selenium configuration that is equivalent to the noble gas of the coming before period, is abbreviated together . For atoms with countless electrons, this notation have the right to become lengthy and so an abbreviation notation is used.This is important as it is the Valence electron 3d10 4s2 4p4, electron in the outermost shell that recognize the chemistry properties the the element.

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Unabbreviated digital configuration of neutral Selenium

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

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

Atomic structure of Selenium

Selenium atom radius is 103 pm, while it"s covalent radius is 116 pm.

atom Radius

103 afternoon (1.03 Å)

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

Atomic Spectrum of Selenium

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Selenium chemical Properties: Selenium Ionization Energies and also electron affinity

The electron affinity that Selenium is 195 kJ/mol

Valence 6
Electronegativity 2.55
ElectronAffinity 195 kJ/mol

Ionization power 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 listed below table for Selenium physics 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 proportion 0.33

Hardness that Selenium - exam to measure up of Hardness the 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 listed below for the electric properties that Selenium

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

Selenium Heat and Conduction Properties

heat Conductivity 0.52 W/(m K)
Thermal expansion N/A

Selenium Magnetic Properties

Magnetic form Diamagnetic
Curie allude 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 table of contents 1.000895

Acoustic nature of Selenium

speed of Sound 3350 m/s

Selenium thermal Properties - Enthalpies and also thermodynamics

Refer come table below for thermal properties that Selenium

Melting point 494 K (221 °C)
Boiling allude 958 K (685 °C)
crucial Temperature 1766 K
Superconducting point N/A

Enthalpies of Selenium

warm of fusion 5.4 kJ/mol
warm of Vaporization 26 kJ/mol
warm of burning "N/A", "N/A", "N/A" J/(kg K)

Selenium isotope - nuclear Properties that Selenium

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


Isotope Isotope mass % variety T fifty percent Decay setting
65Se
66Se
67Se
68Se
69Se
70Se
71Se
72Se
73Se
74Se 0.89% stable 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% stable N/A
81Se
82Se 8.73%
83Se
84Se
85Se
86Se
87Se
88Se
89Se
90Se
91Se
92Se
93Se
94Se

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

CAS Number CAS7782-49-2
RTECS Number N/A, RTECSVS7700000, N/A
period Hazard course 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 hazards N/ A, N/ A, N/ A
NFPA health and wellness Rating N/A, 2, N/A
NFPA Reactivity Rating N/A, 0, N/A
Autoignition point N/A
Flashpoint N/A

Database Search

perform of distinct identifiers to find the element in miscellaneous chemical registry databases

Database id number
CAS Number - chemical Abstracts service (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 v all other nonmetal elements

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