Metals and Nonmetals Class 8 Science - Physical Properties of Metals and Nonmetals

Metals and Nonmetals Class 8 Science Chapter 4 - Physical Properties of Metals and Nonmetals

During classification of elements scientist considered few properties that differentiate between metals and nonmetals. Here are the physical properties of metals and non metals –
Lustre:
In pure state all metals have shining surface. This property is called metallic lustre. Nonmetals on the other hand, are dull therefore does not have lustre.
Hardness:
The hardness varies from metal to metal. On the other hand nonmetals can be cut or broken easily. So, Comparing metals and nonmetals you can find that nonmetals are soft while metals are hard.
Malleability:
Iron nail and aluminium wire change their shape but coal piece and pencil lead break into pieces. Harder we beat greater is the change of shape. Thus metals if beaten change their shape and forms thin sheet on beating. This property is called malleability. Comparing metals and nonmetals you can find that nonmetals can’t form thin sheet by beating, instead they undergo breaking.
Ductility:
Another interesting property of metals is the ability to form thin wires, it is called ductility. With this property you can see wires of aluminium, copper, iron. Nonmetals does not show this property and breaks if we try to form wires.
Sonority: The property of producing ringing sound when a substance is struck by hard substance is called sonority. Metals are sonorous but nonmetals are not.
Conduction of heat:
If one end of iron rod is heated then we can feel rise in temperature at other end also. This means that metals conduct heat. Nonmetals does not conduct heat.
Conduction of electricity:
Metals are good conductor of electricity while nonmetals are insulators.

Exceptions:
Sodium and potassium are soft and can be easily cleaved i.e. cut to form plane surface by knife however these belongs to metals. Similarly, all metals are solid except mercury which exist in liquid form. Iodine is a non-metal but it is lustrous. Diamond is hardest substance which is a nonmetal.

[sonudj]

THANKYOU SO MICH MA'AM THIS VIDEO IS HELPING ME TO UNDERSTAND THIS CHAPTER EASILY DURING PANDEMIC TIME 😊😊🌹🌹🌺🌺😍😍🤩🤩👸👸

[GamingZone-lctm]

Thanks Mam I understood this part of physical properties actually doubt but u clarified me thank u mam

[allroundergarimasharma]

Thank you ma'am it is very helpful for me really ma'am thank you once again ma'am🙂

[aanyagupta]

You are a great teacher 👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻

[kalpanaghogare]

you have explain it very properly.... i have understand it and i will score good marks in exam..

[jot-oxis]

Mam thanks a lot for wonderful explanation

[anithamahadevappa]

Very very helpful vedio mam..Thank you so

[laddugopal_priyaju]

thanks mam for a great teaching your teaching style a very no words to say

[jayayashu]

no words to speak mam, it is like a fire (your teaching mam) i like your teaching mam.

[laughlauncher]

Super you are teaching well
I like it☺️☺️

[vamshi]

Thank u madam you are teaching very clearly and others are not

[anithajoseph]

Please upload reaction of metals and non metals with acid and base

[pranjalighuge]

very nice explanation and it is very helpful for me thanks 🙏

[IncredibleMJayanthiandMhemasri]

It's very interesting and helpful for us mam...love the explanation👌👌👍👍 but it's ''does not conduct heat'' not ''dose not conduct heat''

[kofiannor]

Nice video
I wish to know more about metal
Please can you send me a link

[Umang_Prasad]

Mam what about brittleness and physical state?