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Sodium (Natrium)
Chemical Properties & Compounds
| Symbol | Atomic Number | Atomic Weight | Melting Point | Boiling Point | Phase | Density | Classification |
| Na | 11 | 22.98976928 | 97.72 °C | 883 °C | Solid | 0.968 g/cm3 | Alkali Metal |
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|
|
| General |
| Name, symbol, number |
sodium, Na, 11 |
| Chemical series |
alkali metals |
| Group, period, block |
1, 3, s |
| Appearance |
silvery white
 |
| Standard atomic weight |
22.98976928(2) g·mol−1 |
| Electron configuration |
[Ne] 3s1 |
| Electrons per shell |
2, 8, 1 |
| Physical properties |
| Phase |
solid |
| Density (near r.t.) |
0.968 g·cm−3 |
| Liquid density at m.p. |
0.927 g·cm−3 |
| Melting point |
370.87 K
(97.72 °C, 207.9 °F) |
| Boiling point |
1156 K
(883 °C, 1621 °F) |
| Critical point |
(extrapolated)
2573 K, 35 MPa |
| Heat of fusion |
2.60 kJ·mol−1 |
| Heat of vaporization |
97.42 kJ·mol−1 |
| Heat capacity |
(25 °C) 28.230 J·mol−1·K−1 |
Vapor pressure
| P/Pa |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T/K |
554 |
617 |
697 |
802 |
946 |
1153 |
|
| Atomic properties |
| Crystal structure |
cubic body centered |
| Oxidation states |
1
(strongly basic oxide) |
| Electronegativity |
0.93 (Pauling scale) |
Ionization energies
(more) |
1st: 495.8 kJ·mol−1 |
| 2nd: 4562 kJ·mol−1 |
| 3rd: 6910.3 kJ·mol−1 |
| Atomic radius |
180 pm |
| Atomic radius (calc.) |
190 pm |
| Covalent radius |
154 pm |
| Van der Waals radius |
227 pm |
| Miscellaneous |
| Magnetic ordering |
paramagnetic |
| Electrical resistivity |
(20 °C) 47.7 nΩ·m |
| Thermal conductivity |
(300 K) 142 W·m−1·K−1 |
| Thermal expansion |
(25 °C) 71 µm·m−1·K−1 |
| Speed of sound (thin rod) |
(20 °C) 3200 m/s |
| Young's modulus |
10 GPa |
| Shear modulus |
3.3 GPa |
| Bulk modulus |
6.3 GPa |
| Mohs hardness |
0.5 |
| Brinell hardness |
0.69 MPa |
| CAS registry number |
7440-23-5 |
| Selected isotopes |
|
|
| References |
|
Sodium Compounds
|
Source: Wikipedia article Sodium
|
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Chemistry Quick Facts
