Q40 of 149 Page 192

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

In the various shell of the atom there are arrangements of electrons which is known as electronic configuration. Oxygen whose atomic number is 8 have the E.C 2,6


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38

State two observations which show that atom is not indivisible.

 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?

 41

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

 41

Name the scientist who discovered the nucleus of atom