Element: Lithium
General data
| Element name | Lithium |
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| Chemical symbol | Li |
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| Atomic number Z | 3 |
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| Year discovered | 1817 |
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| Standard state (25°C) | Solid |
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| Category | Alkali metal |
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| Block | s |
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| Atomic mass | 6.94 |
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| CPK color | #CC80FF |
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Physical properties
| Melting point | 453.65 K (180.50 °C) |
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| Boiling point | 1615 K (1342 °C) |
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| Density | 0.534 g/cm³ |
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Energy properties
| First ionization energy | 5.392 eV |
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| Electron affinity | 0.618 eV |
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Atomic structure
| Protons | 3 (Atomic number) |
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| Neutrons (Li-7, most abundant isotope) | 4 |
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| Electrons | 3 |
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| Electron configuration | [He] 2s¹ |
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| Oxidation states | +1 |
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| Electronegativity (Pauling) | 0.98 |
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| Atomic radius (van der Waals) | 182 pm |
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Ionization energies - NIST ASD (3 states)
Value type as given by NIST ASD: measured - from evaluated experimental data; calculated - from ab initio calculations (mostly highly ionised atoms that have not been measured; for the simplest ones, e.g. H I, the calculation is more accurate than measurement); semi-empirical - from interpolation, extrapolation or another semi-empirical method.
