helpful for class 8 and 9

2. 1. AAKASH KUMAR
DAV JAMALPUR CLASS IX ‘B’

4. 1.Sodium
2.Potassium
3.Lithium
4.Rubidium
5.Cesium
6.Francium
7.Beryllium
8.Magnesium
9.Calcium
10.Strontium
11.Barium
12.Radium
13.Aluminum
14.Gallium
15.Iridium
16.Tin
17.Tungsten
18.Lead
19.Bismuth
20.scandium

5. 21.Titanium
22.Platinum
23.Chromium
24.Manganese
25.Iron
26.Cobalt
27.Nickel
28.Copper
29.Zinc
30.gold
31.mercury
32.uranium
33.Technetium
34.Ruthenium
35.Rhodium
36.Palladium
37.Silver
38.Cadmium
39.Lanthanum

6. 1. Argon
2. Astatine
3. Bromine
4. Carbon
5. Chlorine
6. Fluorine
7. Helium
8. Hydrogen
9. Iodine
10.krypton
11.Neon
12.Nitrogen
13.Oxygen
14.Phosphorus
15.Radon
16.Selenium
17.Sulphur
18.xenon

8. Difference between metals and non-metals
Physical state
Metals are all solids, except mercury, which is a liquid
Non - metals may be solid,liquid or gaseous
Melting and boiling point
Metals generally have high melting and boiling point
Non- metals have generally have low melting and boiling point
Density
Metals have high density
Non -Metals have low density

9. Hardness
Metals are hard with exceptions of sodium and potassium
Non -metals are not hard ,except diamond
Lustre
metals possess a natural shine.
non-Metals have a dull appearance.
Malleability and ductility
Metals are malleable and ductile.
Non-metals are brittle.

10. Tensile strength
Metals have high tensile strength
Non –metals do not have tensile strength
Thermal and electrical conductivity
Metals are good thermal and electrical conductors
Non- Metals are non-coductors except graphite.
Sonorosity
metals are sonorous
Non-metals are not sonorous

11. Gold is the second least reactive
metal it is also called noble metal.
The purity of gold is expressed in
terms of carats
Pure gold is very soft. Therefore it is not
used for making jewellery in this form
for this purpose it is mixed with silver or
copper to make it hard. Gold is very
ductile and malleable. Hence it is used
for making jewellery
Gold is used for making
jewellery

13. SILVER
Silver is the third least reactive metal.it is also a
noble metal. Silver is not chemically affected by the
substances around them.
Silver is highly ductile and malleable that is, they can
be drawn in to extremely thin wires and can be beaten
in to very thin foils It is also a good conductor of
electricity.it is also used for making jewellery,
decoration pieces, tableware, etc.

16. Aluminium,being a very light metal, is
used for making aircraft bodies .it is also
used for making cooking vessels and
thin foils which are used for packaging
of food stuffs and medicines
Aeroplane body made up of
aluminium
Aluminium foil made up of
aluminium

17. Copper – Copper is a metal.it is also a good conductor of
electricity. It is also used for making utensils and also used for
making electric wires
Copper used for making utensils. Copper used for making wire

19. nitrogen-nitrogen is a non-metal. It is normally used
by plant for their proper growth and
development

24. Graphite-it is a type of carbon which is used in pencil for
writing purposes.it is also a good conductor of electricity
Graphite used in pencil

25. 0
5
10
15
20
25
30
Reactivity series of metals
potassium
sodium
calcium
magnesium
aluminium
zinc
iron
lead
copper
mercury
silver