Scoperta	1861 Crookes
Abbondanza	0.85
Raggio	2.1
Elettronegatività	2.04
Ionizzazione	6.1082
Numero di isotopi	28
Configurazione elettronica	[Xe] 4f14 5d10 6s2 6p1
Stati di ossidazione	1,3
Elettrone per livello di energia	2,8,18,32,18,3

Minerali contenenti questo elemento : 73

Minerale	Durezza	Densità	Formula
	2.00 / 2.50	5.99	AgHg₂TlAs₂S₆
	2.00 / 2.00	9.57	Tl₂O₃
	2.00 / 2.00	4.50	TlAs₅S₈
		3.00	TlPb₄(Sb₇As₂)S₁₈
	2.00 / 2.00	7.36	Cu₄Tl₂Se₄
	1.00 / 1.00	8.10	Tl₂S
	3.00 / 3.50	5.10	Tl₄Pb₂(Sb,As)₂₀S₃₄
	2.00 / 2.50	6.60	(Cu,Fe,Ag)_6.3(Tl,K)₂SbS₄
	1.00 / 2.00	6.20	TlHgAsS₃
		2.97	K₆Cu₆Tl³⁺Cl₁₇(OH)₄Â·H₂O
	3.00 / 3.50	6.00	Ag₂Au₃TlSb₁₀S₁₀
	2.50 / 3.00	6.90	Cu₇TlSe₄
	4.00 / 4.00	8.42	Cu₂(Sb,Tl)
	3.00 / 3.50		Tl₄Pb₂(As,Sb)₂₀S₃₄
	3.00 / 4.00	3.85	TlFe³⁺₃(SO₄)₂(OH)₆
			AgTl₃Pb₄As₁₁Sb₉S₃₆
	2.50 / 3.00	5.00	TlPbAs₃S₆
	2.00 / 2.00	7.10	Tl₃AsS₃
			Tl₆Pb₃₂As₇₀S₁₄₀
	2.00 / 3.00	5.00	Tl₂SnAs₂S₆
			Tl₄(VO)₃(SO₄)₅Â·5H₂O
	2.00 / 2.50	6.19	Tl₃AsS₄
			CuFe₂TlAs₂S₆
	3.50 / 4.00	6.29	[Ag₆As₂S₇][Ag₁₀HgAs₂S₈]
	1.50 / 2.00	5.38	Tl₂AgCu₂As₃S₇
	3.00 / 3.00	5.40	(Hg₅Cu)CsAs₄S₁₂
	2.00 / 2.50	4.02	Tl₂As_7.5Sb_0.3S₁₃
		5.00	AgPbTlAs₂S₅
			Tl₂Pb₄₈As₈₂S₁₇₂
			TlPb₂Cl₅
			Tl₇Pb₂₂As₅₅S₁₀₈
		11.18	Au₃TlTe₂
	1.50 / 2.00	4.60	TlPbAs₅S₉
	2.00 / 2.00	4.39	Tl_5.8As_15.4S₂₆
	2.00 / 2.00	5.08	Tl₅Sb₉(As,Sb)₄S₂₂
	2.00 / 2.50	5.24	TlPbAs₂SbS₆
	2.00 / 2.00	4.74	Tl₂VO(SO₄)₂Â·H₂O
	3.00 / 4.00	7.21	TlCl
	3.00 / 3.50	2.22	TlAl(SO₄)₂Â·12H₂O
	2.00 / 2.50	5.53	TlAsS₂
		5.91	TlBi(SO₄)₂
			TlI
	2.50 / 3.00	5.04	TlSb₅S₈
	2.50 / 2.50	3.85	CsFe₂S₃
	4.00 / 5.00	2.14	K₉NaCa(Si₂₄Al₁₂)O₇₂Â·15H₂O
	3.00 / 3.50		TlAs₃S₅
	2.00 / 2.00	5.20	TlFe₂S₃
	3.50 / 3.50	4.97	TlSb₃As₂S₈
			Tl_5-xPb_2x(Sb,As)_21-xS₃₄ (x~1.2-1.5)
	2.50 / 3.00		Tl₅Ag₄As₆SbS₁₅
		6.40	TlFeS₂
			AgZn₂TlAs₂S₆
	3.00 / 3.00	5.41	Ag₂Pb_12-xTl_x/2As_18+x/2S₄₀
	2.50 / 2.50	6.00	(Ag,Tl)₂Pb₈Sb₈S₂₁
		4.81	Tl₅Sb₅As₈S₂₂
	3.00 / 3.50	7.78	(Tl,Pb,K)₂Cu_8.7Sb₂S₄
	3.50 / 3.50	5.83	CuTlHg₂As₂S₆
	2.50 / 2.50	6.00	Cu₆TlSe₄
	3.00 / 3.00	5.10	PbAs₂S₄
	3.00 / 3.00		TlAg₂(As,Sb)₃S₆
			TlHgAs₃S₆
			Tl₂Cu₂As₂S₅
	3.50 / 4.00	4.97	TlCu(Zn,Fe,Hg)₂As₂S₆
		5.74	Tl₃BiCl₆
	2.50 / 3.00	6.15	(Cu,Fe)₄Tl₂S₄
	1.00 / 1.50	5.26	Tl₆(Fe,Ni)₂₅S₂₆Cl
			TlFe₄[(AsO₄)₃(OH)₄]Â·4H₂O
	3.00 / 3.50	5.00	TlHgSb₄S₇
	3.50 / 3.50	5.30	Hg₃Tl₄As₈Sb₂S₂₀
		6.15	Pb₂₀Sn₂(Bi,As)₂₂S₅₄Cl₆
		5.00	CuPbTlAs₂S₅
	1.50 / 1.50	5.79	TlSbS₂
	2.50 / 2.50	2.75	Cu₃FeS₃Â·2H₂O