METALLOIDS

PHYSICAL PROPORTIES OF METALOIDS

• They have properties of metals and nonmetals
• Can be shiny or dull
• They are Ductile
• They are Malleable
• They can Conduct heat and electricity but not as well as metals
• They are solids

CHEMICAL PROPERTIES OF METALLOIDS

• They can form alloys with metals
• Oxidation is also a chemical property of metalloids.oxidation is to readily form glasses
• Melting is another chemically property of metalloids. When some melt they contract on melting.

USES FOR METALLOIDS

• Boron is used in cookware as borosilicate glass, in laundry products as borax and sodium perborate, and in insecticide as boric acid.
• Silicon is used in computers for their parts and alloyed with iron for electrical steel and also aluminum for automotive parts.
• Germanium is used in optic fibers as its oxide, germania, is alloyed with silver for tarnish-resistant sterling silver to be made and with silicon to create high-speed integrated circuits.
• Arsenic is alloyed with lead in car batteries and with germanium for high-speed integrated circuits and LEDs.
• Antimony is used as its oxide as a flame retardant, is alloyed with lead in car batteries, and with silicon in circuits.
• Tellurium is used in some types of solar panels, and as both the suboxide and as a compound with germanium and antimony for rewritable optical disks dvd etc.It is also added to glass for use in glass fibers for telecommunications.
• Neither polonium nor astatine are used in everyday life because of a to high radioactivity.

VALENCE ELECTRONS

• Boron has 3 valence electrons
• Silicon has 4 valence electrons and so does germanium
• Arsenic and antimony have 5 valence electrons.
• Tellurium has 6 valence electrons.
• Astatine has 7 valence electrons.

SILICON

SILICON

BORON

BORON

INTERESTING FACTS ABOUT METALLOIDS

• They have properties of metals and nonmetals.