Discovery	1817 Berzelius
Abundance	0.05
Radius	1.2
Electronegativity	2.55
Ionization	9.7524
Number of isotopes	20
Electronic configuration	[Ar] 3d10 4s2 4p4
Oxidation states	-2,2,4,6
Electron by energy level	2,8,18,6

Minerals containing this element : 139

Mineral	Hardness	Density	Formula
Abramovite			Pb₂SnInBiS₇
Achávalite	2.50 / 2.50	6.53	FeSe
Aguilarite	2.00 / 3.00	7.40	Ag₄SeS
Ahlfeldite	2.00 / 2.50	3.37	NiSeO₃Â·2H₂O
Alfredopetrovite	2.50 / 2.50	2.50	Al₂(Se⁴⁺O₃)₃Â·6H₂O
Allochalcoselite	3.00 / 4.00	4.65	Cu¹⁺Cu²⁺₅PbO₂(SeO₃)₂Cl₅
Antimonselite	3.50 / 3.50	5.88	Sb₂Se₃
Athabascaite	2.50 / 3.00	6.00	Cu₅Se₄
Babkinite	2.00 / 2.00	8.09	Pb₂Bi₂(S,Se)₃
Bambollaite	3.00 / 3.00	5.64	Cu(Se,Te)₂
Bellidoite	1.50 / 2.00	7.03	Cu₂Se
Berzelianite	2.00 / 2.00	6.70	Cu_2-xSe (x~0.12)
Bohdanowiczite	3.00 / 3.00	7.87	AgBiSe₂
Bornhardtite	4.00 / 4.00		Co²⁺Co³⁺₂Se₄
Brodtkorbite	2.50 / 3.00	7.77	Cu₂HgSe₂
Bukovite	2.00 / 2.00	7.36	Cu₄Tl₂Se₄
Burnsite	1.00 / 1.50		KCdCu₇O₂(SeO₃)₂Cl₉
Cadmoselite	4.00 / 4.00	5.66	CdSe
Carlosruizite	2.50 / 3.00	3.42	K₃Na₂Na₃Mg₅(IO₃)₆(SeO₄)₆Â·6H₂O
Chalcomenite	2.00 / 2.50	3.31	CuSe⁴⁺O₃Â·2H₂O
Chaméanite	4.50 / 4.50	6.17	(Cu,Fe)₄As(Se,S)₄
Chloromenite	1.50 / 2.50		Cu₉O₂(Se⁴⁺O₃)₄Cl₆
Chrisstanleyite	5.00 / 5.00	8.31	Ag₂Pd₃Se₄
Clausthalite	2.50 / 2.50	7.60	PbSe
Clinochalcomenite	2.00 / 2.00	3.28	CuSe⁴⁺O₃Â·2H₂O
Cobaltomenite	2.00 / 2.50	3.39	CoSe⁴⁺O₃Â·2H₂O
Crerarite	3.00 / 3.00	7.00	(Pt,Pb)Bi₃(S,Se)_4-x (x= 0.4-0.8)
Crookesite	2.50 / 3.00	6.90	Cu₇TlSe₄
Cupromakovickyite	4.00 / 4.50	6.78	Cu₄AgPb₂Bi₉S₁₈
Demesmaekerite	3.00 / 4.00	5.28	Pb₂Cu₅(UO₂)₂(Se⁴⁺O₃)₆(OH)₆Â·2H₂O
Derriksite		4.72	Cu₄(UO₂)(Se⁴⁺O₃)₂(OH)₆
Downeyite		4.15	SeO₂
Drysdallite	1.00 / 1.50	6.25	MoSe₂
Dzharkenite	5.00 / 5.00	7.34	FeSe₂
Eldragónite	3.50 / 3.50		Cu₆BiSe₄(Se₂)
Eskebornite	3.00 / 3.50	5.35	CuFeSe₂
Eucairite	2.50 / 2.50	7.60	CuAgSe
Favreauite	3.00 / 3.00	4.85	PbBiCu₆O₄(SeO₃)₄(OH)Â·H₂O
Ferroselite	6.00 / 6.50	7.21	FeSe₂
Fischesserite	2.00 / 2.50	9.05	Ag₃AuSe₂
Francisite	3.00 / 4.00	5.00	Cu₃Bi(Se⁴⁺O₃)₂O₂Cl
Freboldite	2.50 / 3.00	7.00	CoSe
Geffroyite	2.50 / 2.50	5.39	(Cu,Fe,Ag)₉Se₈
Georgbokiite	4.00 / 4.00		Cu₅O₂(Se⁴⁺O₃)₂Cl₂
Giraudite	3.50 / 4.00	5.75	Cu₆[Cu₄(Fe,Zn)₂]As₄Se₁₃
Grundmannite	2.00 / 2.50	6.58	CuBiSe₂
Guanajuatite	2.50 / 3.50	6.25	Bi₂Se₃
Guilleminite	2.00 / 2.00	4.88	Ba(UO₂)₃(Se⁴⁺O₃)₂O₂Â·3H₂O
Hakite	5.00 / 5.00	6.30	Cu₁₀Hg₂Sb₄Se₁₃
Hansblockite	2.00 / 2.50		(Cu,Hg)(Bi,Pb)Se₂
Hastite	6.00 / 6.00	7.22	CoSe₂
Haynesite	1.50 / 2.00	4.10	(UO₂)₃(Se⁴⁺O₃)₂(OH)₂Â·5H₂O
Ikunolite	2.00 / 2.00	7.80	Bi₄S₃
Ilinskite	1.50 / 2.00	4.08	NaCu₅O₂(Se⁴⁺O₃)₂Cl₃
Jacutingaite	3.50 / 3.50		Pt₂HgSe₃
Jagüéite	5.00 / 5.00	8.01	Cu₂Pd₃Se₄
Jolliffeite	6.00 / 6.50	7.10	NiAsSe
Jonassonite	2.50 / 3.00		Au(Bi,Pb)₅S₄
Junoite	3.50 / 4.00	6.77	Cu₂Pb₃Bi₈S₁₆
Kalungaite		7.59	PdAsSe
Kawazulite	1.50 / 1.50	7.79	Bi₂Te₂Se
Kitkaite	3.50 / 3.50	7.19	NiTeSe
Klockmannite	2.00 / 2.50	5.99	Cu_5.2Se₆
Krut'aite	4.00 / 4.00	6.00	CuSe₂
Kudriavite		6.58	(Cd,Pb)Bi₂S₄
Kullerudite	5.50 / 6.50	6.72	NiSe₂
Kurilite			Ag₈Te₃Se
Laitakarite	2.00 / 2.00	8.12	Bi₄Se₃
Laphamite	1.00 / 2.00	4.50	As₂Se₃
Larisaite	1.00 / 1.00		Na(H₃O)(UO₂)₃(Se⁴⁺O₃)₂O₂Â·4H₂O
Litochlebite	3.00 / 3.00	7.90	Ag₂PbBi₄Se₈
Luberoite	5.00 / 5.50	13.02	Pt₅Se₄
Mäkinenite	2.50 / 3.00	7.00	NiSe
Mandarinoite	2.50 / 2.50	2.93	Fe³⁺₂(Se⁴⁺O₃)₃Â·6H₂O
Marthozite	6.00 / 6.00	4.44	Cu²⁺(UO₂)₃(Se⁴⁺O₃)₂O₂Â·8H₂O
Mgriite	4.50 / 5.00	4.00	(Cu,Fe)₃AsSe₃
Miessiite	2.00 / 2.50	10.94	Pd₁₁Te₂Se₂
Milotaite	4.50 / 4.50	7.95	PdSbSe
Molybdomenite	3.50 / 3.50	7.07	PbSe⁴⁺O₃
Mozgovaite	2.50 / 3.50		PbBi₄(S,Se)₇
Munakataite	1.50 / 1.50	5.53	Pb₂Cu₂(Se⁴⁺O₃)SO₄(OH)₄
Mutnovskite	2.00 / 2.00	6.18	Pb₂AsS₃I
Naumannite	2.50 / 2.50	6.50	Ag₂Se
Nestolaite	2.50 / 2.50	3.16	CaSeO₃Â·H₂O
Nevskite	3.00 / 3.00	7.00	Bi(Se,S)
Nicksobolevite	2.00 / 2.50	4.18	Cu₇(SeO₃)₂O₂Cl₆
Nordströmite	2.00 / 2.50	7.00	Pb₃CuBi₇S₁₄
Olsacherite	3.00 / 3.50	6.55	Pb₂(Se⁶⁺O₄)(SO₄)
Oosterboschite	5.00 / 5.00	8.48	(Pd,Cu)₇Se₅
Orlandiite			Pb₃Cl₄(Se⁴⁺O₃)Â·H₂O
Padmaite	3.00 / 4.00	9.00	PdBiSe
Palladseite	4.50 / 5.00	8.30	Pd₁₇Se₁₅
Parageorgbokiite	3.00 / 4.00	4.70	Cu₅O₂(SeO₃)₂Cl₂
Paraguanajuatite	2.50 / 3.00	6.60	Bi₂Se₃
Pauladamsite	2.00 / 2.00	3.54	Cu₄(SeO₃)(SO₄)(OH)₄Â·2H₂O
Pekoite	2.00 / 3.00	6.00	CuPbBi₁₁S₁₈
Penroseite	2.50 / 3.00	6.58	NiSe₂
Penzhinite		8.00	(Ag,Cu)₄Au(S,Se)₄
Permingeatite	4.00 / 4.50	5.00	Cu₃SbSe₄