a/c to bohr's model of atom , atom consist of 3 fundamental particles these are electrons , protons and neutrons . electrons have negatively charged , protons have positively charged and neutrons are neutral .
protons and neutrons are located in the small control part of the atom called as nucleus and particles are also called as nucleus .
electrons are revolving around the nucleus in a certain circular chord called as shell . that are denoted by K,L,M,N,.....
maximum number of electron that can be accomodated in any cells is followed by the formula 2n^2 .where n is the number of cell .
each shell is associated with certain amount of energy . the energy level nearer to the nucleus have minimum amount of energy level which is farthest from the nucleus has maximum amount of energy .
there is no change in the energy of electron as they keep revolving in the same energy level . the change is take place only when it jumps from lower shell to higher shell or higher shell to lower shell