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Reference



Metalloids (Semimetals)
Chemical Properties, Physical Properties and General Information


Radioactive Material Sign
Radioactive Natural Element
Radioactive Material Sign
Radioactive Synthetic Element
Toxic Material Sign
Toxic Element
Name Sym. No. Atomic
Weight
Melting
Point
Boiling
Point
Phase Density Valence
Electrons
Oxidation
States
Boron Toxic Element 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 Toxic Element As 33 74.92160 817 C 614 C Solid 5.727 g/cm3 4s2 4p3 3, 5
(mildly acidic oxide)
Antimony Toxic Element Sb 51 121.760 630.63 C 1587 C Solid 6.697 g/cm35s2 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 Radioactive Natural Element Toxic Element Po 84 209 254 C 962 C Solid 9.32 g/cm3 6s2 6p4 +4, +2, -2
(amphoteric oxide)

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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