ATOMIC STRUCTURE :
TO START WITH, AN ATOM CONSISTS OF OF MANY FUNDAMENTAL PARTICLES. BUT MOST PROMINENT OF THEM ARE THE WELL KNOWN ELECTRONS, PROTONS & NEUTRONS. IN THE ANCIENT PERIOD, PEOPLE BELIEVED THAT AN ATOM WAS INDIVISIBLE AND BY ANY MEANS CANNOT BE DIVIDED. BUT AS THE CURIOSITY NEVER SITS QUIET, SCIENTISTS EXPERIMENTED ON RADIOACTIVITY, ELECTROMAGNETISM etc., AND AFTER MANY YEARS OF INTELLECTUAL WORK, PHYSICISTS DISCOVERED THAT THE SO CALLED, "INDIVISIBLE" ATOM WAS A CONGLOMERATE OF VARIOUS SUBATOMIC PARTICLES ( CHIEFLY , ELECTRONS , PROTONS , & NEUTRONS ).