ସେଲେନିଅମ

ଉଇକିପିଡ଼ିଆ ରୁ
Selenium
34Se
S

Se

Te
arsenicseleniumbromine
ଭୌତିକ ରୁପ
black and red allotropes
ସାଧାରଣ ଧର୍ମ
ନାମ, ପ୍ରତୀକ,
ପରମାଣୁ କ୍ରମାଙ୍କ
selenium, Se,
34
ଉଚ୍ଚାରଣ /sɪˈlniəm/ si-lee-nee-əm
ମୌଳିକ ପ୍ରକାର nonmetal
sometimes considered a metalloid
ଶ୍ରେଣୀ, ପର୍ଯ୍ୟାୟ, ବ୍ଲକ୍ 16 (chalcogens), 4, p
ମାନକ ପରମାଣବିକ ଓଜନ 78.96
ଇଲେକ୍‌ଟ୍ରୋନ୍ ବିନ୍ୟାସ [Ar] 3d10 4s2 4p4
2, 8, 18, 6
Electron shells of selenium (2, 8, 18, 6)
ଇତିହାସ
ଆବିଷ୍କାର Jöns Jakob Berzelius and Johann Gottlieb Gahn (1817)
First isolation Jöns Jakob Berzelius and Johann Gottlieb Gahn (1817)
ଭୌତିକ ଧର୍ମ
ଅବସ୍ଥା solid
(ରୁମ୍ ଟେମ୍ପରେଚର୍‌ରେ ଘନତା) (gray) 4.81 g·cm−3
Density (near r.t.) (alpha) 4.39 g·cm−3
Density (near r.t.) (vitreous) 4.28 g·cm−3
Liquid density at m.p. 3.99 g·cm−3
ଗଳନାଙ୍କ 494 K, 221 °C, 430 °F
ସ୍ଫୁଟନାଙ୍କ 958 K, 685 °C, 1265 °F
କ୍ରିଟିକାଲ୍ ପଏଣ୍ଟ 1766 K, 27.2 MPa
Heat of fusion (gray) 6.69 kJ·mol−1
Heat of vaporization 95.48 kJ·mol−1
Molar heat capacity 25.363 J·mol−1·K−1
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 500 552 617 704 813 958
Atomic properties
Oxidation states 6, 4, 2, 1,[୧] -2
(strongly acidic oxide)
Electronegativity 2.55 (Pauling scale)
Ionization energies 1st: 941.0 kJ·mol−1
2nd: 2045 kJ·mol−1
3rd: 2973.7 kJ·mol−1
Atomic radius 120 pm
Covalent radius 120±4 pm
Van der Waals radius 190 pm
Miscellanea
Crystal structure hexagonal
Magnetic ordering diamagnetic[୨]
Thermal conductivity (amorphous) 0.519 W·m−1·K−1
Thermal expansion (25 °C) (amorphous) 37 µm·m−1·K−1
Speed of sound (thin rod) (20 °C) 3350 m·s−1
Young's modulus 10 GPa
Shear modulus 3.7 GPa
Bulk modulus 8.3 GPa
Poisson ratio 0.33
Mohs hardness 2.0
Brinell hardness 736 MPa
CAS registry number 7782-49-2
Most stable isotopes
Main article: Isotopes of selenium
iso NA half-life DM DE (MeV) DP
72Se syn 8.4 d ε - 72As
γ 0.046 -
74Se 0.87% 74Se is stable with 40 neutrons
75Se syn 119.779 d ε - 75As
γ 0.264, 0.136,
0.279
-
76Se 9.36% 76Se is stable with 42 neutrons
77Se 7.63% 77Se is stable with 43 neutrons
78Se 23.78% 78Se is stable with 44 neutrons
79Se trace 3.27×105 y β 0.151 79Br
80Se 49.61% 80Se is stable with 46 neutrons
82Se 8.73% 1.08×1020 y ββ 2.995 82Kr
· r

ସେଲେନିଅମ ହେଉଛି ଏକ ରାସାୟନିକ ମୌଳିକ ଯାହାର ପ୍ରତୀକ Seପରମାଣୁ କ୍ରମାଙ୍କ ୩୪ ଅଟେ ।

ଧର୍ମ[ସମ୍ପାଦନା]

ଉପସ୍ଥିତି[ସମ୍ପାଦନା]

ଗଠନ[ସମ୍ପାଦନା]

ଉତ୍ପାଦନ[ସମ୍ପାଦନା]

ସମସ୍ଥାନିକ[ସମ୍ପାଦନା]

ବ୍ୟବହାର[ସମ୍ପାଦନା]

ଆଧାର[ସମ୍ପାଦନା]

  1. Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0080379419. 
  2. Magnetic susceptibility of the elements and inorganic compounds, in Lide, D. R., ed. (2005). CRC Handbook of Chemistry and Physics (86th ed.). Boca Raton (FL): CRC Press. ISBN 0-8493-0486-5. 

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