metals , non metals and alloys

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u know that this is my science project of summer vacation !!!!!!! cool na ?????

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By: neerajmehta161 (16 month(s) ago)

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Presentation Transcript

Slide 1: 

By Surbhi Gupta Class VIII-E Presentation on Metals, Non Metals and Alloys

Metals, Non-Metals and Alloys : 

Metals, Non-Metals and Alloys The Basics Reactivity Metalloids Alloys

The Periodic Table is divided into…. : 

The Periodic Table is divided into…. Metals

Slide 4: 

Common Elements and Symbols

Metals : 

Metals Physical Properties : Shiny Luster Malleable Ductile Conductivity Magnetism High Melting and Boiling Point High density All are solids at room temperature (except Mercury). Easily lose electrons.

Malleable : 

A malleable material is one that can be pounded into shapes Malleable

Ductile : 

A ductile material is one that can be stretched into a thin wire. Ductile

Conductivity : 

A good conductor allows heat and electricity easily to pass through the material Conductivity

Magnetism : 

Materials that are attracted to magnets and can be made into magnets are called magnetic. Magnetism

Slide 11: 

Non - Metals The Periodic Table is divided into….

Nonmetals : 

Nonmetals Physical Properties: Dull Luster Not conductors Brittle- not malleable Not ductile Low Density Low Melting and Boiling Point Many are Gases at room temperature. Tends to gain electrons

Slide 13: 

Nonmetals More than 97% of your body is made of nonmetals. BACK

Different metals are suitable for different jobs. : 

Different metals are suitable for different jobs.

Slide 16: 

It is also unreactive making it suitable for holding and carrying water.

Slide 17: 

Aluminium is a reactive metal, but it forms a coating of very stable aluminium oxide. This, together with its lightness and malleability gives it many uses from window frames to insulation foil.

Slide 18: 

As it forms, iron oxide constantly flakes away exposing more of the iron underneath. Remember: Only iron oxide is called rust. No other metal rusts!

Slide 19: 

Like aluminium, zinc oxidises to form a stable coating of zinc oxide which protects the iron underneath it. This is called galvanising.

Slide 20: 

Lead is very dense, unreactive and malleable - making it suitable for fishing weights and roof sealing. Lead fumes have been linked to brain damage so it is now considered too toxic to be used inside houses (e.g. as in old-fashioned water pipes) BACK

Slide 21: 

Metalloids Metalloids can have properties of both metals and nonmetals. Metalloids (metal-like) have properties of both metals and non-metals. They are solids that can be shiny or dull They conduct heat and electricity better than non-metals but not as well as metals. They are ductile and malleable.

Metalloids : 

Metalloids Silicon is a metalloid. Silicon is brittle like a nonmetal but can conduct electricity like a metal. Silicon is found in computer chips, glass and sand. BACK

Slide 23: 

Alloys Metals can be used in the form of alloys. An Alloy is a homogeneous mixture of two or more metals or a metal and a non-metal. Alloys are generally stronger and harder Resistant to corrosion.

Slide 24: 

Alloys

Slide 25: 

Thank You Any queries?