The Electrons

The atoms are consists small tiny negatively charges particles having negligible mass is known as   electrons.

features of an electron is-

(i). charge on an electron, e = 1.602 x 10^-19 coulomb

(ii). mass of an electron, m= 9.0 x 10^-31 kg

(iii). radius of an electron, r = 1.9 x 10^-15 m 

Energy of an electron:-

An electron moving around the nucleus of an atom consist two energies. one is the kinetic energy(K.E) due to its motion and another one is potential energy(P.E) due to the charge on the nucleus.

        i.e. total energy of an electron = K.E + P.E

The energy of an electron increases as its distances from the nucleus increases. that means electrons in the last orbit possess very high energy as compared to the electrons in the inner orbits.