Selenio

Selenium
	34Se
	arsenic ← selenium → bromine
Panagway
	black and red allotropes;
Kinatibuk-ang mga kinaiya
Ngalan, simbolo, kaiphan	selenium, Se, 34
Paglitok	/sᵻˈliːniəm/ [[Help:Pronunciation respelling key\|si-Plantilya:Smallcaps all-nee-əm]]
Kategoriyang elemento	wala puthaw; sometimes considered a metalloid
Group, period, block	16, 4, p
Gibug-aton sa atomo	78.96
Kontorno sa elektron	[Ar] 3d10 4s2 4p4; 2, 8, 18, 6 Electron shells of selenium (2, 8, 18, 6)
History
Pagkadiskobre	Jöns Jakob Berzelius and Johann Gottlieb Gahn (1817)
First isolation	Jöns Jakob Berzelius and Johann Gottlieb Gahn (1817)
Physical properties
Phase	magahi
Density (near r.t.)	(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
Melting point	494 K, 221 °C, 430 °F
Boiling point	958 K, 685 °C, 1265 °F
Critical point	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
Atomic properties
Oxidation states	6, 4, 2, 1, -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
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
	v; t; e; · r

Ang selenio (Iningles selenium) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga Se ug kaiphan nga atomik 34. Ang selenio mao ang wala puthaw.

Ang mga gi basihan niini

↑ Plantilya:Greenwood&Earnshaw
↑ 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.

Galeriya sa hulagway

[1] Plantilya:Greenwood&Earnshaw

[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.

[1]

[2]