Element Properties
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Periodic Table
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Reference
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Metalloids (Semimetals)
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 |
| Boron | B | 5 | 10.811 | 2076 °C | 3927 °C | Solid | 2.34 g/cm3 | 2s2 2p1 | +3,
(mildly acidic oxide) |
| Silicon | Si | 14 | 28.0855 | 1414 °C | 3265 °C | Solid | 2.33 g/cm3 | 3s2 3p2 | +4,-4, +2
(amphoteric oxide) |
| Germanium | Ge | 32 | 72.64 | 938.25 °C | 2833 °C | Solid | 5.323 g/cm3 | 4s2 4p2 | +2, -2, +4
(amphoteric oxide) |
| Arsenic | As | 33 | 74.92160 | 817 °C | 614 °C | Solid | 5.727 g/cm3 | 4s2 4p3 | ±3, 5
(mildly acidic oxide) |
| Antimony | Sb | 51 | 121.760 | 630.63 °C | 1587 °C | Solid | 6.697 g/cm3 | 5s2 5p3 | -3, +3, 5 | |
| Tellurium | Te | 52 | 127.60 | 449.51 °C | 988 °C | Solid | 6.24 g/cm3 | 5s2 5p4 | ±2, 4, 6
(mildly acidic oxide) |
| Polonium | Po | 84 | 209 | 254 °C | 962 °C | Solid | 9.32 g/cm3 | 6s2 6p4 | +4, +2, -2
(amphoteric oxide) |
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Metalloids: have properties of both metals and nonmetals: they are solids, shiny or dull, ductile, malleable, conduct heat and electricity better than nonmetals but not as well as metals. Their chemical reactions are typical of both metals and nonmetals.
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Chemistry Quick Facts
