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2. ATOMIC STRUCTURE

3. INTRODUCTION AND IMPORTANCE OF ATOMIC STRUCTURE

4. What these images reflect ?

5. Hi, imagine that you have entered into the cosmos for a second. Do you know what our scientists are doing round the clock around the globe? They are searching for the known and unknown things in the cosmos i.e., universe.

6. The most striking feature of research is to search for the invisible matter. ..

7. The early thinkers speculated on the idea that matter was made up of extremely small particleswith characteristic properties.

8. The reason is that if they were able to subdivide any sample of matter into smaller and smaller pieces, they would ultimately come to a particle so small that further subdivision could be humanly impossible. Matter Particles Atoms Molecules

9. Origin of the word atom • The word atom has been derived from the Greek word ‘a-tomio’ ,which means uncut-able or non-divisible.

10. What is the first theory of matter that has sound scientific base? Dalton’s atomic theory (1808) describes that, “The atom is the ultimate particle of matter”.

11. What is Dalton’s atomic theory on matter? Atoms are indivisible and no other particle of matter exists as small as atom.

12. Mcqs The scientist behind the smallest particle of matter is… a) J.J. Thomson b) Rutherford c) R. A. Millikan d) John Dalton

13. SUBATOMIC PARTICLES

14. What are the smaller particles present in atom called? Subatomic particles Which experiments lead to the point that atom is not the ultimate but it is divisible further and contains subatomic particles in it ? 1) Discharge Tube Experiments 2) Faraday’s Laws of Electrolysis All of these 3) Artificial Radioactivity

15. What are the subatomic particles discovered initially? 1) Electron 2) Proton 3) Neutron Answer : All of these

16. What were the major challenges did the scientists faced when the discovery of subatomic particles took place? 1) To explain the stability of atom. 2) To compare the behaviour of one element from other in terms of both physical and chemical properties. 3) To explain the formation of different kinds of molecules by the combination of different atoms. 4) To understand the origin and nature of the characteristics of electromagnetic radiation absorbed or emitted by atoms.

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