Sélénium, 34 Sé Sélénium seleniyum· Pabaosan (sə-LEE -nee-əm ) Cingakan alotrop klau sané kacingak sekadi logam, abang, miwah ireng (nénten kagambarang) Bobot atom standar A r, std (Sé) 7001789710000000000♠ 78.971(8)[1] Sélénium ring tabél périodik
Wilangan atom (Z ) 34 Watek golongan 16 (kalkogén) Période période 4 Blok blok-p Konpigurasi éléktron [Ar ] 3d10 4s2 4p4 Éléktron per kulit 2, 8, 18, 6 Cecirén pisik Pase ring STP padet Titik lebur 494 K (221 °C, 430 °F) Titik didih 958 K (685 °C, 1265 °F) Kapadetan (nampek s.r. ) gray: 4.81 g/cm3 alpha: 4.39 g/cm3 vitreous: 4.28 g/cm3 ri kala éncéh (ring t.l. ) 3.99 g/cm3 Titik kritis 1766 K, 27.2 MPa Panes fusi gray: 6.69 kJ/mol Panes panguapan 95.48 kJ/mol Kapasitas panes molar 25.363 J/(mol·K) Tekanan uap
P (Pa)
1
10
100
1 k
10 k
100 k
at T (K)
500
552
617
704
813
958
Cecirén atom Paindikan oksidasi −2 , −1, 0,[2] +1,[3] +2 , +3, +4 , +5, +6 (oksida asam kuat)Kaéléktronégatipan skala Pauling: 2.55 Wasa ionisasi ka-1: 941.0 kJ/mol ka-2: 2045 kJ/mol ka-3: 2973.7 kJ/mol Jeriji atom émpiris: 120 pm Jeriji kovalén 120±4 pm Jeriji Van der Waals 190 pm Cecirén liyanan Rupa alami primordial Struktur kristal trigon Kagelisan swara pales tipis 3350 m/s (ring 20 °C) Ékspansi térmal amorphous: 37 µm/(m⋅K) (ring 25 °C) Konduktivitas térmal amorphous: 0.519 W/(m⋅K) bacakan magnétik diamagnétik [4] Karentanan magnétik molar 3004750000000000000♠ −25.0× 10−6 cm3 /mol (298 K)[5] Modulus Young 10 GPa Modulus Shear 3.7 GPa Modulus Bulk 8.3 GPa Rasio Poisson 0.33 Kakatosan Mohs 2.0 Kakatosan Brinell 736 MPa Nomor CAS 7782-49-2 Lelintihan Pangaranan mawit Séléné , Dewi bulan Yunani Panemuan miwah isolasi kapertamaJöns Jakob Berzelius miwah Johann Gottlieb Gahn (1817)Isotop utama sélénium
Kategori:Sélénium | pustaka
Sé:
ring
itung saking C
bina
parihindik
pus
C
221
—
—
K
494
494
0
F
430
430
0
présisi maks
0
WD
392 392
[6]
dagingan
C: 221, K: 494, F: 430
pabligbagan
Sé:
ring
itung saking C
bina
parihindik
pus
C
685
—
—
K
958
958
0
F
1265
1265
0
présisi maks
0
WD
1.265 1.265
[6]
dagingan
C: 685, K: 958, F: 1265
pabligbagan
Pustaka
Pustaka pacang tampil ring suratan, menawi lis puniki wantah tampil ring kaca puniki.
↑ Méija, Juris; et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry . 88 (3): 265–91. doi :10.1515/pac-2015-0305 .
↑ A Se(0) atom has been identified using DFT in [ReOSe(2-pySe)3 ]; see Cargnelutti, Roberta; Lang, Ernesto S.; Piquini, Paulo; Abram, Ulrich (2014). "Synthesis and structure of [ReOSe(2-Se-py)3]: A rhenium(V) complex with selenium(0) as a ligand". Inorganic Chemistry Communications . 45 : 48–50. doi :10.1016/j.inoche.2014.04.003 . ISSN 1387-7003 .
↑ Mal:Greenwood&Earnshaw
↑ Magnetic susceptibility of the elements and inorganic compounds , ring Lide, D. R., ed. (2005). CRC Handbook of Chemistry and Physics (édisi ka-86). Boca Raton (FL): CRC Press. ISBN 0-8493-0486-5 .
↑ Weast, Robert (1984). CRC, Handbook of Chemistry and Physics . Boca Raton, Florida: Chemical Rubber Company Publishing. pp. E110. ISBN 0-8493-0464-4 .
↑ 6,0 6,1 http://www.cdc.gov/niosh/npg/npgd0550.html .