89
Ac
Actinium
(227)
2818321892
#89
Actinium
actinide· Solid·227 u
Actinium is a radioactive chemical element with symbol Ac (not to be confused with the abbreviation for an acetyl group) and atomic number 89, which was discovered in 1899. It was the first non-primordial radioactive element to be isolated. Polonium, radium and radon were observed before actinium, but they were not isolated until 1902.
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Identity
- Symbol
- Ac
- Atomic Number
- 89
- Atomic Mass
- 227 u
- Category
- actinide
- Block
- f-block
- Period
- 7
- Group
- 3
- Appearance
- Chemical element with atomic number 89 (Ac)
- Year Discovered
- 1899 CE
- Discovered By
- Friedrich Oskar Giesel
- Named By
- light beam
Electrons
- Configuration
- [Rn] 6d1 7s2
- Full Configuration
- 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 6d1
- Shells
- 2, 8, 18, 32, 18, 9, 2
- Electronegativity
- 1.1
- Electron Affinity
- 33.77
- Oxidation States
- +3
- Ionization Energies
- 499, 1170
Physical Properties
- State at
- Solid
- Melting Point
- 1500
- Boiling Point
- 3500
- Density
- 10
- Molar Heat
- 27.2 J/(mol·K)
- Crystal Structure
- FCC
- Magnetic Ordering
- Paramagnetic
Mechanical
- Covalent Radius
- 215 pm
- Metallic Radius
- 195 pm
Thermal & Electrical
- Thermal Conductivity
- 12 W/(m K) W/(m·K)
- Specific Heat
- 120 J/(kg K) J/(g·K)
- Heat of Vaporization
- 400 kJ/mol kJ/mol
- Heat of Fusion
- 14 kJ/mol kJ/mol
Abundance
- Universe
- 0
- Sun
- 0
- Meteorite
- 0
- Earth's Crust
- 5.5e-7 ppm
- Ocean
- 0
- Human Body
- 0