सेलेनियम
34
Se
समूह
16
आवर्त
4
ब्लॉक
p
प्रोटॉन
इलेक्ट्रॉन्स
न्यूट्रॉन
34
34
45
सामान्य गुण
परमाणु संख्या
34
परमाणु भार
78.96
द्रव्यमान संख्या
79
श्रेणी
अन्य अधातुएँ
रंग
सलेटी
रेडियोधर्मी
नहीं
From the Greek word Selene, moon
क्रिस्टल की संरचना
सरल मोनोक्लिनिक
इतिहास
Selenium was first observed in about the year 1300 by the alchemist Arnold of Villanova.
Selenium was discovered in 1817 by Jöns Jacob Berzelius and Johan Gottlieb Gahn who noted the similarity of the new element to the previously-known tellurium.
In 1873, Willoughby Smith found that the electrical resistance of grey selenium was dependent on the ambient light.
Selenium was discovered in 1817 by Jöns Jacob Berzelius and Johan Gottlieb Gahn who noted the similarity of the new element to the previously-known tellurium.
In 1873, Willoughby Smith found that the electrical resistance of grey selenium was dependent on the ambient light.
इलेक्ट्रॉन प्रति शेल
2, 8, 18, 6
इलेक्ट्रॉन कॉन्फिगरेशन
[Ar] 3d10 4s2 4p4
Selenium deficiency in animals can lead to slow growth
भौतिक गुण
अवस्था
ठोस
घनत्व
4.809 g/cm3
गलनांक
494.15 K | 221 °C | 429.8 °F
क्वथनांक
958.15 K | 685 °C | 1265 °F
विलय ऊष्मा
5.4 कि.जूल/मोल
वाष्पीकरण ऊष्मा
26 कि.जूल/मोल
विशिष्ट ऊष्मा क्षमता
0.321 जूल/ग्राम•केल्विन
पृथ्वी की पपड़ी में प्रचुरता
5×10-6%
ब्रह्मांड में प्रचुरता
3×10-6%
सी ए एस संख्या
7782-49-2
PubChem सी.आई.डी. संख्या
6326970
परमाण्विक गुण
परमाणु का त्रिज्या
120 pm
संयोजी त्रिज्या
120 pm
इलेक्ट्रोनेगेटिविटी
2.55 (पाइलिंग पैमाना)
आयनीकरण ऊर्जाएं
9.7524 eV
परमाणु आयतन
16.45 से.मी.३/मोल
तापीय चालकता
0.0204 W/cm·K
ऑक्सीकरण स्थितियां
-2, 2, 4, 6
उपयोग
Selenium is used in the glass industry to decolorize glass and to make red-colored glasses and enamels.
It is used as a catalyst in many chemical reactions.
It is also used as a photographic toner, and as an additive to stainless steel.
Selenium sulfide is used in anti-dandruff shampoos.
It is used as a catalyst in many chemical reactions.
It is also used as a photographic toner, and as an additive to stainless steel.
Selenium sulfide is used in anti-dandruff shampoos.
Many of selenium's compounds, such as selenates and selenites, are highly toxic
समस्थानिक
स्थिर आइसोटोप
74Se, 76Se, 77Se, 78Se, 80Seअस्थिर समस्थानिक
65Se, 66Se, 67Se, 68Se, 69Se, 70Se, 71Se, 72Se, 73Se, 75Se, 79Se, 81Se, 82Se, 83Se, 84Se, 85Se, 86Se, 87Se, 88Se, 89Se, 90Se, 91Se, 92Se, 93Se, 94Se