2. Dry Ice is also called as Solid Carbon Dioxide.
3. Brass is an alloy of Copper and Zinc.
4. The atoms of an element which have the same atomic number but different mass number is called Isotopes.
5. Lavoisier is the father of Modern Chemistry.
6. Carbon, Hydrogen and Oxygen are essential elements in all Organic compound.
7. Carbon is added to pure Iron to make it strong and hard.
8. Mendelev is the father of Periodic Table.
9. Cathode rays consists beam of Electrons.
10. Nucleus of an atom consists of Protons and Neutrons.
11. Atomic Number of an element is equal to the number of protons.
12. Nuclei which have equal number of neutrons are called Isotones.
13. Bromine, which is a non metal, is liquid at room temperature.
14. pH value of drinking water - 6.5 to 8.5
15. The atoms of an element which have different atomic number but same mass number is called Isobars.
16. The percentage of Oxygen by volume in the atmosphere is 21%.
17. As the sea water has more denser or have more density than the normal water, so a swimmer finds it easier to swim in sea water than in normal water.
18. The percentage of Oxygen by weight in the atmosphere is 23%.
19. Electron was discovered by J.J. Thomson.
20. Proton and Neutron was discovered by Rutherford and James Chadwick, respectively.
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