- Some properties of the nitrogen group elements
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▪ TableSome properties of the nitrogen group elementsnitrogen phosphorus (white)atomic number 7 15atomic weight 14.0067 30.9738colour of element colourless whitemelting point (°C) −209.86 44.1boiling point (°C) −195.8 280density at 25 °C(grams per cubic centimetre) 1.25 (grams per litre) 1.82solubility in water(volume per volume of water) 0.0231 nonevalence 3, (5) 3, 5isotopic abundance (terrestrial, percent) nitrogen-14 (99.63), nitrogen-15 (0.37) phosphorus-31 (100)radioactive isotopes (mass numbers) 12, 13, 16, 17 28–30, 32–34heat of fusion (calories per gram) 6.1 5.03heat of vaporization (calories per gram) 47.7 130specific heat (calories per gram per °C) 0.249 (diatomic) 0.189critical temperature (°C) −147.1 675critical pressure (atm) 33.5 80electrical resistivity (microhm-centimetres) — 1 × 1017hardness (Mohs' scale) — 0.5crystal structure at 20 °C — cubicradiuscovalent (angstroms) 0.74 1.10ionic (+3 ion, angstroms) 0.16 0.44ionization energy (first, kilocalories per mole) 337 255electronegativity(Pauling) 3.05 2.15(Sanderson) 4.49 3.34arsenic antimony bismuthatomic number 33 51 83atomic weight 74.9216 121.75 208.980colour of element steel gray silver pinkish silvermelting point (°C) 817 (28 atm) 630.5 271.3boiling point (°C) 613 (sublimes) 1,380 1,560density at 25 °C(grams per cubic centimetre) 5.73 6.684 9.8solubility in water(volume per volume of water) none none nonevalence 3, 5 3, 5 3, 5isotopic abundance (terrestrial, percent) arsenic-75 (100) antimony-121 (57.25), antimony-123 (42.75) bismuth-209 (100)radioactive isotopes (mass numbers) 68–74, 76–81, 85 112–120, 122, 124–135 196, 199–208, 210–215heat of fusion (calories per gram) 88.5 38.3 12.5heat of vaporization (calories per gram) 102 161 204.3specific heat (calories per gram per °C) 0.082 0.0494 0.0294critical temperature (°C) — — —critical pressure (atm) — — —electrical resistivity (microhm-centimetres) 33.3 (20 °C) 39 (0 °C) 106.8 (0 °C)hardness (Mohs' scale) 3.5 3.0–3.5 2.5crystal structure at 20 °C hexagonal hexagonal hexagonalradiuscovalent (angstroms) 1.19 1.38 1.46ionic (+3 ion, angstroms) 0.58 0.76 0.96ionization energy (first, kilocalories per mole) 228 201 170electronegativity(Pauling) 2.10 2.05 1.8(Sanderson) 3.91 3.37 3.16See as table:
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Universalium. 2010.