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Nonmetals
Chemical Properties, Physical Properties and General Information
Radioactive Natural Element | 
Radioactive Synthetic Element | 
Toxic Element |
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| Name | Sym. | No. | Atomic
Weight | Melting
Point | Boiling
Point | Phase | Density | Valence
Electrons | Oxidation
States |
| Hydrogen | H | 1 | 1.00794 | -259.14 °C | -252.87 °C | Gas | 0.08988 g/L | 1s1 | 1, -1
(amphoteric oxide) |
| Carbon | C | 6 | 12.0107 | 3550°C | 3800 °C | Solid | 2.267 g/cm3 | 2s2 2p2 | +4, -4, +2
(mildly acidic oxide) |
| Nitrogen | N | 7 | 14.0067 | -210.00 °C | -195.79 °C | Gas | 1.251 g/L | 2s2 2p3 | ±3, +5, +4, -2
(strongly acidic oxide) |
| Oxygen | O | 8 | 15.9994 | -218.79 °C | -182.95 °C | Gas | 1.429 g/L | 2s2 2p4 | -2, -1
(neutral oxide) |
| Phosphorus | P | 15 | 30.973762 | 44.2 °C | 277 °C | Solid | 1.82 g/cm3 | 3s2 3p3 | ±3, +5, +4
(mildly acidic oxide) |
| Sulfur | S | 16 | 32.065 | 115.21 | 444.6 °C | Solid | 2.067 g/cm3 | 3s2 3p4 | -1, ±2, +4, 6
(strongly acidic oxide) |
| Selenium | Se | 34 | 78.96 | 221 °C | 685 °C | Solid | 4.809 g/cm3 | 4s2 4p4 | ±2, +4, +6
(strongly acidic oxide) |
| Halogens - Group 17 of the Periodic Table |
| Fluorine | F | 9 | 18.9984032 | -219.62 °C | -188.12 °C | Gas | 1.7 g/L | 2s22p5 | -1 (strongly acidic oxide) |
| Chlorine | Cl | 17 | 35.453 | -101.5 °C | -34.04 °C | Gas | 3.2 g/L | 3s23p5 | ±1, 3, 5, 7
(strongly acidic oxide) |
| Bromine | Br | 35 | 79.904 | -7.3 °C | 58.8 °C | Liquid | 3.1028 g/cm3 | 4s24p5 | ±1, 5
(strongly acidic oxide) |
| Iodine | I | 53 | 126.904 | 113.7 °C | 184.3 °C | Solid | 4.933 g/cm3 | 5s25p5 | ±1, 5, 7
(strongly acidic oxide) |
| Astatine | At | 85 | 210 | 302 °C | 337 °C | Solid | 7 g/cm3 | 6s26p5 | ±1, 3, 5, 7 |
| Ununseptium | Uus | 117 | 294 ? | Unknown | Unknown | Solid ? | Unknown | 7s27p5 | N/A |
| Noble Gases - Group 18 of the Periodic Table |
| Helium | He | 2 | 4.002602 | -272.2 °C | -268.93 °C | Gas | 0.1786 g/L | 1s2 | 0 |
| Neon | Ne | 10 | 20.1797 | -248.59 °C | -246.08 °C | Gas | 0.9002 g/L | 2s22p6 | 0 |
| Argon | Ar | 18 | 39.948 | -189.35 °C | -185.85 °C | Gas | 1.784 g/L | 3s23p6 | 0 |
| Krypton | Kr | 36 | 83.798 | -157.36 °C | -153.22 °C | Gas | 3.749 g/L | 4s24p6 | +2 |
| Xenon | Xe | 54 | 131.293 | -111.7 °C | -108.12 °C | Gas | 5.894 g/L | 5s25p6 | rarely more than 0 |
| Radon | Rn | 86 | 222 | -71.15 °C | -61.85 °C | Gas | 9.73 g/L | 6s26p6 | 0 |
| Ununoctium | Uuo | 118 | 294 | Unknown | Unknown | Gas | Unknown | 7s27p6 | ? 0 |
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Nonmetals: Unlike metals, which are electrically and heat conductive, nearly all nonmetals are either insulators or semiconductors and poor conductors of heat. Non-metals are usually unreactive. They can be either solid, liquid or gas. Their solid forms are more commonly brittle and not ductile like metals. They usually have lower densities and melting points than metals.
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Chemistry Quick Facts
