Q41 of 149 Page 192

What is the nucleus of an atom and what is the nature of charge on it?

At the center of the atom a small positively charged particle is present this is known as nucleus. The nucleus is positively charged particle.

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39

All the gases form cathode rays and anode rays when electricity is passed through them:

(i) What does the formation of cathode rays tell us about the atoms?


(ii) What does the formation of anode rays tell us about the atoms?

 40

What do you understand by the tern ‘electronic configuration” of an element? Write down the electronic configuration of oxygen (At. No. = 8).

 41

Name the scientist who discovered the nucleus of atom

 42

Name the particles used by Rutherford in his experiment on the discovery of nucleus. Also state the charge on these particles.