SSC REVISION POINTS AND IMPORTANT NOTES OF NCERT

Radioactivity
The phenomenon of spontaneous emission of radiation by heavy element is called radioactivity and the element which show this phenomenon are called radioactive element.



Alpha particle
An alpha particle is a helium nucleus having two neutron and two proton.when electron orbiting around the nucleus of helium atom are knocked out completely we get a double ionised helium atom called alpha particle.

Beta particle
A beta particle is a fast moving electron.

Gama particle
Gama particle are packet of electromagnetic radiation and are known as photons.they do not have any charge and their rest mass is zero.

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