• Explore SchoolMyKids in English

Periodic Table Element Comparison: Compare Elements - Selenium vs Tellurium

Compare Selenium and Tellurium

Compare Selenium and Tellurium on the basis of their properties, attributes and periodic table facts. Compare elements on more than 90 properties. All the elements of similar categories show a lot of similarities and differences in their chemical, atomic, physical properties and uses. These similarities and dissimilarities should be known while we study periodic table elements. You can study the detailed comparison between Selenium vs Tellurium with most reliable information about their properties, attributes, facts, uses etc. You can compare Se vs Te on more than 90 properties like electronegativity , oxidation state, atomic shells, orbital structure, Electronaffinity, physical states, electrical conductivity and many more.

123456789101112131415161718
1
1
H
Hydrogen
1.008

Atomic #

Electronic Shell #

Symbol
Name
Atomic Weight
HGas
HgLiquid
CSolid
Metals
Metalloids
NonMetals
Alkali metals
Alkali earth metals
Lanthanoids
Transition metals
Post-transition metals
Other nonmetals
Halogens
Nobel gas
Actinoids
2
He
Helium
4.003
2
3
Li
Lithium
6.941
4
Be
Beryllium
9.012
5
B
Boron
10.811
6
C
Carbon
12.011
7
N
Nitrogen
14.007
8
O
Oxygen
15.999
9
F
Fluorine
18.998
10
Ne
Neon
20.180
3
11
Na
Sodium
22.990
12
Mg
Magnesium
24.305
13
Al
Aluminium
26.982
14
Si
Silicon
28.085
15
P
Phosphorus
30.974
16
S
Sulfur
32.065
17
Cl
Chlorine
35.453
18
Ar
Argon
39.948
4
19
K
Potassium
39.098
20
Ca
Calcium
40.078
21
Sc
Scandium
44.956
22
Ti
Titanium
47.867
23
V
Vanadium
50.941
24
Cr
Chromium
51.996
25
Mn
Manganese
54.938
26
Fe
Iron
55.845
27
Co
Cobalt
58.933
28
Ni
Nickel
58.693
29
Cu
Copper
63.546
30
Zn
Zinc
65.409
31
Ga
Gallium
69.723
32
Ge
Germanium
72.640
33
As
Arsenic
74.922
34
Se
Selenium
78.960
35
Br
Bromine
79.904
36
Kr
Krypton
83.798
5
37
Rb
Rubidium
85.468
38
Sr
Strontium
87.620
39
Y
Yttrium
88.906
40
Zr
Zirconium
91.224
41
Nb
Niobium
92.906
42
Mo
Molybdenum
95.940
43
Tc
Technetium
98
44
Ru
Ruthenium
101.070
45
Rh
Rhodium
102.906
46
Pd
Palladium
106.420
47
Ag
Silver
107.868
48
Cd
Cadmium
112.411
49
In
Indium
114.818
50
Sn
Tin
118.710
51
Sb
Antimony
121.760
52
Te
Tellurium
127.600
53
I
Iodine
126.904
54
Xe
Xenon
131.293
6
55
Cs
Cesium
132.905
56
Ba
Barium
137.327
57 - 71
La - Lu
Lanthanides
72
Hf
Hafnium
178.490
73
Ta
Tantalum
180.948
74
W
Tungsten
183.840
75
Re
Rhenium
186.207
76
Os
Osmium
190.230
77
Ir
Iridium
192.217
78
Pt
Platinum
195.078
79
Au
Gold
196.967
80
Hg
Mercury
200.590
81
Tl
Thallium
204.383
82
Pb
Lead
207.200
83
Bi
Bismuth
208.980
84
Po
Polonium
209
85
At
Astatine
210
86
Rn
Radon
222
7
87
Fr
Francium
223
88
Ra
Radium
226
89 - 103
Ac - Lr
Actinides
104
Rf
Rutherfordium
261
105
Db
Dubnium
262
106
Sg
Seaborgium
266
107
Bh
Bohrium
264
108
Hs
Hassium
277
109
Mt
Meitnerium
268
110
Ds
Darmstadtium
281
111
Rg
Roentgenium
272
112
Cn
Copernicium
285
113
Nh
Nihonium
284
114
Fl
Flerovium
289
115
Mc
Moscovium
288
116
Lv
Livermorium
292
117
Ts
Tennessine
294
118
Og
Oganesson
294
Lanthanides
57
La
Lanthanum
138.905
58
Ce
Cerium
140.116
59
Pr
Praseodymium
140.908
60
Nd
Neodymium
144.240
61
Pm
Promethium
145
62
Sm
Samarium
150.360
63
Eu
Europium
151.964
64
Gd
Gadolinium
157.250
65
Tb
Terbium
158.925
66
Dy
Dysprosium
162.500
67
Ho
Holmium
164.930
68
Er
Erbium
167.259
69
Tm
Thulium
168.934
70
Yb
Ytterbium
173.040
71
Lu
Lutetium
174.967
Actinides
89
Ac
Actinium
227
90
Th
Thorium
232.038
91
Pa
Protactinium
231.036
92
U
Uranium
238.029
93
Np
Neptunium
237
94
Pu
Plutonium
244
95
Am
Americium
243
96
Cm
Curium
247
97
Bk
Berkelium
247
98
Cf
Californium
251
99
Es
Einsteinium
252
100
Fm
Fermium
257
101
Md
Mendelevium
258
102
No
Nobelium
259
103
Lr
Lawrencium
262

Facts

NameSeleniumTellurium
Atomic Number3452
Atomic SymbolSeTe
Atomic Weight78.96 127.6
Phase at STPSolid Solid
ColorGray Silver
Metallic ClassificationOther Nonmetal Metalloid
Group in Periodic Tablegroup 16 group 16
Group Nameoxygen familyoxygen family
Period in Periodic Tableperiod 4 period 5
Block in Periodic Tablep -blockp -block
Electronic Configuration[Ar] 3d10 4s2 4p4 [Kr] 4d10 5s2 5p4
Electronic Shell Structure (Electrons per shell)2, 8, 18, 62, 8, 18, 18, 6
Melting Point494 K722.66 K
Boiling Point958 K1261 K
CAS NumberCAS7782-49-2 CAS13494-80-9
Neighborhood ElementsNeighborhood Elements of SeleniumNeighborhood Elements of Tellurium

History

HistoryThe element Selenium was discovered by J. Berzelius and G. Gahn in year 1817 in Sweden. Selenium derived its name from the Greek selene, meaning 'moon'.The element Tellurium was discovered by F.-J.M. von Reichenstein in year 1782 in Romania. Tellurium derived its name from Latin tellus, meaning 'earth'.
DiscoveryJ. Berzelius and G. Gahn (1817)F.-J.M. von Reichenstein (1782)
IsolatedJ. Berzelius and G. Gahn (1817)H. Klaproth ()

Presence: Abundance in Nature and Around Us

Parts per billion (ppb) by weight / by atoms (1ppb =10^-7 %)

Abundance in Universe30 / 0.59 / 0.09
Abundance in Sun- / -- / -
Abundance in Meteorites13000 / 29002100 / 300
Abundance in Earth's Crust50 / 101.0 / 0.2
Abundance in Oceans0.45 / 0.035- / -
Abundance in Humans50 / 4- / -

Crystal Structure and Atomic Structure

Atomic Volume16.385 cm3/mol20.449 cm3/mol
Atomic Radius103 pm123 pm
Covalent Radius116 pm135 pm
Van der Waals Radius190 pm206 pm
Atomic SpectrumAtomic Spectrum of Selenium | SchoolMyKidsAtomic Spectrum of Tellurium | SchoolMyKids
Lattice Constant905.4, 908.3, 1160.1 pm445.72, 445.72, 592.9 pm
Lattice Angleπ/2, 1.58493, π/2π/2, π/2, 2 π/3
Space Group NameP121/c1 P3121
Space Group Number14 152
Crystal Structure

Simple Monoclinic

34 Se Selenium - Crystal Structure | SchoolMyKids

Simple Trigonal

52 Te Tellurium - Crystal Structure | SchoolMyKids

Atomic and Orbital Properties

Atomic Number3452
Number of Electrons (with no charge)3452
Number of Protons3452
Mass Number78.96127.6
Number of Neutrons4576
Shell structure (Electrons per energy level)2, 8, 18, 62, 8, 18, 18, 6
Electron Configuration[Ar] 3d10 4s2 4p4 [Kr] 4d10 5s2 5p4
Valence Electrons4s2 4p4 5s2 5p4
Oxidation State-2, 2, 4, 6-2, 2, 4, 6
Atomic Term Symbol (Quantum Numbers)3P2 3P2
Shell structure34 Se Selenium - Electron Shell Structure | SchoolMyKids52 Te Tellurium - Electron Shell Structure | SchoolMyKids

Isotopes and Nuclear Properties

Selenium has 5 stable naturally occuring isotopes while Tellurium has 5 stable naturally occuring isotopes.

Known Isotopes65Se, 66Se, 67Se, 68Se, 69Se, 70Se, 71Se, 72Se, 73Se, 74Se, 75Se, 76Se, 77Se, 78Se, 79Se, 80Se, 81Se, 82Se, 83Se, 84Se, 85Se, 86Se, 87Se, 88Se, 89Se, 90Se, 91Se, 92Se, 93Se, 94Se105Te, 106Te, 107Te, 108Te, 109Te, 110Te, 111Te, 112Te, 113Te, 114Te, 115Te, 116Te, 117Te, 118Te, 119Te, 120Te, 121Te, 122Te, 123Te, 124Te, 125Te, 126Te, 127Te, 128Te, 129Te, 130Te, 131Te, 132Te, 133Te, 134Te, 135Te, 136Te, 137Te, 138Te, 139Te, 140Te, 141Te, 142Te
Stable IsotopesNaturally occurring stable isotopes:

74Se, 76Se, 77Se, 78Se, 80Se

Naturally occurring stable isotopes:

120Te, 122Te, 124Te, 125Te, 126Te

Neutron Cross Section 11.7 5.4
Neutron Mass Absorption 0.0056 0.0013

Chemical Properties: Ionization Energies and electron affinity

Valence or Valency6 6
Electronegativity2.55 Pauling Scale2.1 Pauling Scale
Electron Affinity195 kJ/mol190.2 kJ/mol
Ionization Energies
1st: 941 kJ/mol
2nd: 2045 kJ/mol
3rd: 2973.7 kJ/mol
4th: 4144 kJ/mol
5th: 6590 kJ/mol
6th: 7880 kJ/mol
7th: 14990 kJ/mol
1st: 869.3 kJ/mol
2nd: 1790 kJ/mol
3rd: 2698 kJ/mol
4th: 3610 kJ/mol
5th: 5668 kJ/mol
6th: 6820 kJ/mol
7th: 13200 kJ/mol

Physical Properties

Density4.819 g/cm36.24 g/cm3
Molar Volume16.385 cm3/mol20.449 cm3/mol

Elastic Properties

Young Modulus10 43
Shear Modulus3.7 GPa16 GPa
Bulk Modulus8.3 GPa65 GPa
Poisson Ratio0.33 -

Hardness - Tests to Measure of Hardness of Element

Mohs Hardness2 MPa2.25 MPa
Vickers Hardness- -
Brinell Hardness736 MPa180 MPa

Electrical Properties

Electrical Conductivity- 10000 S/m
Resistivity - 0.0001 m Ω
Superconducting Point- -

Heat and Conduction Properties

Thermal Conductivity0.52 W/(m K)3 W/(m K)
Thermal Expansion- -

Magnetic Properties

Magnetic TypeDiamagnetic Diamagnetic
Curie Point- -
Mass Magnetic Susceptibility-4e-9 m3/kg-3.9e-9 m3/kg
Molar Magnetic Susceptibility-3.16e-10 m3/mol-4.98e-10 m3/mol
Volume Magnetic Susceptibility-0.0000193 -0.0000243

Optical Properties

Refractive Index1.000895 1.000991

Acoustic Properties

Speed of Sound3350 m/s2610 m/s

Thermal Properties - Enthalpies and thermodynamics

Melting Point494 K722.66 K
Boiling Point958 K1261 K
Critical Temperature1766 K-
Superconducting Point- -

Enthalpies

Heat of Fusion5.4 kJ/mol17.5 kJ/mol
Heat of Vaporization26 kJ/mol48 kJ/mol
Heat of Combustion- -

Regulatory and Health - Health and Safety Parameters and Guidelines

CAS NumberCAS7782-49-2 CAS13494-80-9
RTECS Number{N/A, RTECSVS7700000, N/A} RTECSWY2625000
DOT Hazard Class{N/A, 6.1, N/A} 6.1
DOT Numbers{N/A, 2658, N/A} 2811
EU Number- -
NFPA Fire Rating{N/A, 0, N/A} 0
NFPA HazardsN/ A, N/ A, N/ A -
NFPA Health Rating{N/A, 2, N/A} 2
NFPA Reactivity Rating{N/A, 0, N/A} 0
AutoIgnition Point- 340 °C
Flashpoint- -

Compare With Other Elements

Compare Selenium with all Group 16 elements

Compare Selenium with all Period 4 elements

Compare Selenium with all Other Nonmetal elements

Compare Tellurium with all Group 16 elements

Compare Tellurium with all Period 5 elements

Compare Tellurium with all Metalloid elements