ATOM

1. FACTS, USES AND LIMITATIONS OF ATOM MODELS

2. COMPARISON Electrons revolve around the nucleus like planets revolve around the sun.

3. AMAZING FACTS Nucleus is 10000 times smaller than atom! Electron is 10000 times smaller than nucleus! (From website www.northernlight.com)

4. VELOCITY OF ELECTRON Velocity of electron in its first orbit is 2190km per sec Aaaaaaaaawwwwhh! (Source taken from CBSE curriculum)

5. ELECTRON PRODUCTION Electrons can be produced in lab by using induction coil, waste bulb and metallic conductor. (Source taken from ‘Association of SCIENCE TEACHERS’ manual.)

6. APPLICATIONS 1.Atom model helps us to study about electrons, nucleus and nuclear particles. 2.It helps us to study about nuclear fission reaction which is the basic principle of nuclear reactor by which we get tremendous amount of energy. 3. It helps us to study the reactions in the stars which are nuclear fusion basically.

7. LIMITATION Rutherford atom model does not explain why electrons which revolve around the nucleus do not loose energy and finally fall into the nucleus.

8. GRAPH No. of alpha particles versus angle of scattering No of alpha particles Angle of scattering 0 30 60 90

9. RESEARCH CALCULATION Repulsive force of Hydrogen atom Formula;f=2Ze*e r Z=1 e=1.6*10 On substituting we get f=5.12*10 -19 r=10 -15 C m -23 Newtons.

10. DIFFERENT ATOM MODELS Rutherford atom model gave rise to different atom models. They are; 1.Bohr atom model 2.Summerfield atom model. 3.Vector atom model. 4.Standard atom model.

11. THE LATEST ATOM MODEL It is Standard atom model . But anyway the foundation was laid only by Sri Rutherford.

12. SO, LET US REMEMBER……. Whenever we enjoy energy from a nuclear fission reactor or simply look around to see the universe………. THE RUTHERFORD ATOM MODEL

13. THANK YOU GE by STM