1. Which was the first subatomic particles discovered ?


2. The fact that atoms contained very light negatively charges particles called electrons had been shown in 1987 at the Cavendish laboratory in Cambridge. Which physicist it associated with discovery ?

J. J. Thomson

3. In 1931 the idea of antiparticles was introduced by Dirac as a necessary consequence by Dirac as a necessary quantum mechanics. Such a particle was discovered a year after at the California Institute of Technology. Who discovered it?

Carl Anderson

4. What is the name given to a heavy isotope of hydrogen in which the nucleus comprises a proton and a neutron rather that a proton alone?


5. The Electron microscope revolutionized science. It has no universally agreed single discoverer. But one scientist was given Nobel prize for the development of transmission electron microscope. Who was he?

Ernst August Friedrich Rusks

6. What is called positronium?

A quasi-atom formed by the combination of a positron, with an electron

7 How many electron shell as known ? What are they?

Seven, named by the letters K, L, M, No, O, P and Q in increasing distance from the nucleus.

8. How many electrons can be accommodated in the M shell?


9. Which term is used for the reaction in which a particles and its antiparticle collide and disappear, released energy?


10. In 1925 a Dutch-US physicist first suggested that electron possess spin. Who was that scientist?

Samuel Abraham Goudsmit

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