Question

State the postulates of daltons atomic theory ?

Describe JJ Thomson experiments on discovery of electrons .

List out the characters of anode rays.

Describe Rutherford model of an atom

Describe the properties of cathode rays

State the conclusion drawn by Alpha ray scattering experiment of Rutherford

Answer 1

Dalton's Atomic Theory

1) All matter is made of atoms. Atoms are indivisible and indestructible.

2) All atoms of a given element are identical in mass and properties

3) Compounds are formed by a combination of two or more different kinds of atoms.

4) A chemical reaction is arearrangement of atoms.


JJ Thompson Atomic Model - Click here

Properties of anode rays-

• They travel in straight line.
• They consisted of material particles.
• They are deflected in electric and magnetic field in opposite to that of cathode rays.
• The nature or e/m ratio of anode rays depend upon the nature of gas present in the cathode ray tube.
• They are( particles of anode rays ) simply positively charged gaseous ions.
• The positively charged particles carry charge equal to whole no. multiple of the fundamental unit of electric charge.

Rutherfords model of atom - Click Here



Important characteristics of Cathode rays:

1. They consist of negatively charged material particles; electrons.
2. They produce X rays. When a beam of cathode rays is made to fall upon a hard metallic target like Tungsten, X-rays are produced.
3. 3. They cause ionization of gas through which they pass. They are deflected by electric and magnetic fields towards positive field.

Conclusion drawn from Alpha ray scattering experiment of Rutherford

1-most of the alpha particles went straight through the foil.
2-some alpha particles were slightly deflected their straight path.
3-very few alpha particles were either deflected by very large angles or completely bounced back....
Hope this will help you.