Properties of the alkali metals
- Properties of the alkali metals
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Properties of the alkali metals
colour of element silver silver silver silver silver —
density at 20 degrees Celsius (grams per cubic centimetre) 0.534 0.971 0.862 1.532 1.873 —
volume increase on melting (
percent) 1.51 2.63 2.81 2.54 2.66 —
mass number of most common isotopes (terrestrial abundance,
percent) 7 (92.6), 6 (7.4) 23 (100) 39 (93.1), 41 (6.88), 40 (0.0119) 85 (72.15), 87 (27.85) 133 (100) —
colour imparted to flame red yellow violet dark red blue —
main spectral emission lines (
wavelength, angstroms) 6,708; 6,104 5,890; 5,896 7,699; 7,665 4,216; 4,202 4,593; 4,555 —
heat of fusion
(calories per mole) 717 621 558 523 500 —
electrical
resistivity at 20–25 degrees Celsius (microhm centimetres) 9.4 4.7 7 12 20 —
(cgs unit) 14.2 (10−6) 16.0 (10−6) 20.8
(10−6) 17.0 (10−6) 29.0 (10−6) —
crystal structure body-centred cubic body-centred cubic body-centred cubic body-centred cubic body-centred cubic —
radius
atomic
(angstroms) 1.52 1.86 2.27 2.48 2.65 —
ionic (+1 ion,
angstroms) 0.9 1.16 1.52 1.66 1.81 1.94
bond,
angstroms) 1.225 1.572 2.025 2.16 2.35 —
oxidation potential for oxidation from the 0 to +1 oxidation state at 25 degrees Celsius (volts) 3.04 2.71 2.92 2.92 2.92 —
See as table:
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Universalium.
2010.
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