22TiTitanium47.867 u
Titanium (Ti)
Titanium is a transition metal with atomic number 22, in period 4 and group 4 of the periodic table. Its atomic mass is 47.867 u and its electron configuration is [Ar] 3d² 4s². Solid at 25 °C.
Key facts
| Atomic number | 22 |
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| Atomic mass | 47.867 u |
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| Category | Transition Metal |
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| Period | 4 |
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| Group | 4 |
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| Block | d |
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| Electron configuration | [Ar] 3d² 4s² |
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| Electrons per shell | 2, 8, 10, 2 |
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| Electronegativity (Pauling) | 1.54 |
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| Oxidation states | −2, −1, +1, +2, +3, +4common in bold |
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| State at 25 °C | Solid |
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| Melting point | 1941 K1667.85 °C |
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| Boiling point | 3560 K3286.85 °C |
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| Density | 4.507 g/cm³ |
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Atomic properties
| First ionization energy | 6.828 eV |
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| Electron affinity | 7.6 kJ/mol |
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| Atomic radius | 147 pm |
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| Covalent radius | 160 pm |
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| Van der Waals radius | 187 pm |
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| Common ions | Ti⁴⁺, Ti³⁺ |
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| Protons, neutrons, electrons | 22, 26, 22 |
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Physical and thermal properties
| Molar volume | 10.64 cm³/mol |
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| Heat of fusion | 18.7 kJ/mol |
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| Heat of vaporization | 425 kJ/mol |
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| Specific heat | 520 J/(kg·K) |
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| Thermal conductivity | 22 W/(m·K) |
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| Thermal expansion | 8.6 × 10⁻⁶ K⁻¹ |
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| Mohs hardness | 6 |
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| Young’s modulus | 116 GPa |
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| Crystal structure | Simple hexagonal |
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| Magnetic type | Paramagnetic |
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Identification and history
| CAS number | 7440-32-6 |
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| Latin name | Titanium |
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| Discovered by | William Gregor · 1791 |
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| Named by | M. Klaproth · 1795 |
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Natural isotopes
| Isotope | Mass (u) | Abundance |
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| 46Ti | 45.952626 | 8.25 % |
| 47Ti | 46.951757 | 7.44 % |
| 48Ti | 47.947941 | 73.72 % |
| 49Ti | 48.947864 | 5.41 % |
| 50Ti | 49.944786 | 5.18 % |
Data checked against PubChem (NIH), IUPAC, the NIST Atomic Spectra Database and the IAEA (NUBASE and AME), the same data you see in the app.
A dash (---) means there is no reliable published measurement. The app never makes one up.
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Periodic Table