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Chapter: 8th Science : Chapter 9 : Matter Around Us

Metalloids

The elements which exhibit the properties of metals as well as non-metals are called metalloids. Examples: Boron, Silicon, Arsenic, Germanium, Antimony, Tellurium and Polonium.

Metalloids

The elements which exhibit the properties of metals as well as non-metals are called metalloids. Examples: Boron, Silicon, Arsenic, Germanium, Antimony, Tellurium and Polonium.

 

a. Physical properties of Metalloids

• Metalloids are solids at room temperature.

• They can form alloys with other metals.

Some metalloids, such as silicon and germanium, can act as electrical conductors under specific conditions. Thus, they are called semiconductors.

Silicon which is a metalloid appears lustrous, but it is neither malleable nor ductile. It is brittle - a characteristic of some non metals. It is a much poorer conductor of heat and electricity than the metals.

The physical properties of metalloids tend to be metallic, but their chemical properties tend to be non-metallic.

 

b. Uses of Metalloids

Silicon is used in electronic devices.

Boron is used in fireworks and as a fuel for ignition in rocket.

 

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