Empirical Formula of Erbium(III) nitrate, hexahydrate (1:3:6) (CAS NO.13476-05-6): H₁₂ErN₃O₁₅
Molecular Weight: 461.3654 
Enthalpy of Vaporization: 37.72 kJ/mol
Boiling Point: 83 °C at 760 mmHg
Vapour Pressure: 49.8 mmHg at 25 °C
Structure of Erbium(III) nitrate, hexahydrate (1:3:6) (CAS NO.13476-05-6):
                         
IUPAC Name: Erbium(3+) trinitrate hexahydrate
Canonical SMILES: [N+](=O)([O-])[O-].[N+](=O)([O-])[O-].[N+](=O)([O-])[O-].O.O.O.O.O.O.[Er+3]
InChI: InChI=1S/Er.3NO3.6H2O/c;3*2-1(3)4;;;;;;/h;;;;6*1H2/q+3;3*-1;;;;;;
InChIKey: SXJVNCWLEGIRSJ-UHFFFAOYSA-N

Poison by intraperitoneal and intravenous routes. When heated to decomposition Erbium(III) nitrate, hexahydrate (1:3:6) (CAS NO.13476-05-6) emits toxic fumes of NO_x.

 Erbium(III) nitrate, hexahydrate (1:3:6) , its cas register number is 13476-05-6. It also can be called Erbium nitrate hexahydrate ; Erbium trinitrate hexahydrate ; and Nitric acid, erbium(3+) salt, hexahydrate .