This document discusses the classification of elements into metals, non-metals, metalloids, and noble gases. Metals are hard, lustrous, malleable, ductile, sonorous, and good conductors of heat and electricity. Non-metals generally do not shine, are soft, are non-conductors of heat and electricity, and do not have properties of malleability or ductility. Metalloids possess some properties of both metals and non-metals, having conductivity between the two and being solid, ductile, and brittle semi-conductors. Noble gases are colorless, odorless, monoatomic gases that are liquifiable at low temperatures and have low melting and boiling points

3. INTRODUCATION:
• ELEMENTS: The substance which is made up of same kind of
atoms is called an Element.
• Chemical symbols are used to represents Elements.
• It is the basic unit of matter and cannot be broken into two or
more simpler substances.

4. CLASSIFICATION OF ELEMENTS:
 Metals
 Non metals
 Metalloids
 Noble gases

5. METALS
• The elements which are hard, lustrous, malleable,
ductile,sonorous and good conductors of heat and
electricity are called metals.
• Examples:

6. PROPERTIES OF METALS:
• Malleability: The property of substances which can be beaten
into thin sheets.

7. PROPERTIES OF METALS:
• Ductility: The property that allows them to draw into wires.

8. PROPERTIES OF METALS:
• Sonorous:metals produce a ringing sound when hit.

9. PROPERTIES OF METALS:
Good conductors: The substances which allow elecrtic current to
pass through them easily.

10. PROPERTIES OF METALS:
• Lustrous:The metals have a shiny appearance or the quality of
shining by reflecting light.

11. NON METALS:
The elements which do not possess the properties of metals are
called non metals.
Examples:

12. DEFFERENCES BETWEEN METALS AND
NON METALS
METALS
• Generally shine
• Metals are hard(except
sodium and potassium).
• Conductors of heat and
electricity.
• Metals are sonorous.
• Metals are malleability and
ductility.
NON METALS
• Generally do not shine.
• Non metals are soft(except
diamond).
• Non conductors of heat and
electricity(except graphite).
• Not sonorous.
• Do not have the properties
of malleability and ductility.

13. METALLOIDS:
• The elements which possess the properties of both metals and
non metals are called metalloids.
• Examples:

14. PROPERTIES OF METALLOIDS:
• Metalloids are solids in nature.
• They are ductile and can be bent into coils.
• Their conductivity lies in between metals and non metals.
• They possess shiny or dull appearance.
• They are brittle in nature.
• Generally metalloids are called semi conductors.
• They have different melting points and boiling points.

15. NOBLE GASES
• The elements which do not combine together because of their
special nature are called noble gases.
• Examples:

16. PROPERTIES OF NOBLE GASES
• Noble gases are colourless and odourless.
They can be easily liquified at low temperature.
• They are mono atomic.
• They have very low melting and boiling points.