Metalloids are the smallest class of elements rather than others two classes of elements that’s are metals and non metals.
Metalloids are the compound which show properties in between metals and non metals .
It look like metals but mostly behave like non metals .
They are also called as semi metals .
All metalloids are solid at room temperature.
They are not metal or non metals they are in between them.
They are show various colours.
There are Six Metalloids present on earth .
They can act as a semiconductor.
They are p block element .
In the below picture shaded element is a metalloids.
Examples : Boron (B), Silicon(Si) , germanium(Ge) ,arsenic(As), Antimony (Sb) ,Tellurium(Te).
Physical properties:
Metalloids show some physical
properties of metals and non metals .
- They are look like metal
- They are shiny or dull.
- There shape easily changed.
- They are ductile and malleable .
- They conduct electricity but not like metals
- They have ability to conduct heat
- They show low elasticity .
- They are brittle than metals
- They have tendency to gain electron easily
- They show various colour.
Chemical properties:
- They have three – six valence electron in their valance shell. So they can lose or gain electron easily.
- Boron have only three valance electron in outer shell.
- Arsenic , antimony ,tellurium have more than four electron . hence they gain electron easily. it act as non metals.
- Silicon and germanium have four electron in outer shell.
- They can form alloys with other metals.
Question :
1.) Which Metalloids use in electronic components ? Why?
– Silicon and germanium is use in electronic device.
Because it have four electron in outer shell they can easily gain or lose electron it can act as a semiconductor
2.) Why the Metalloids are not corrode?
– Metals are corrode but Metalloids show properties of both metal and non metals hence they are not corrode.
3.) Which is the most found Metalloids?
– silicon is the mostly found Metalloids on earth.
4.) Which is the least found Metalloids?
– tellurium is the least found Metalloids.
5.) Give some uses of Boron?
– Boron use in fire works because it changed colour into green when it burnt .
It is also use in pest controlling agent.