WELCOME FRIENDS!!!!! today we are going to talk about the matter what is an atom? ATOMS ARE THE BASIC UNIT OF ALL MATTER,THE STRU CTURE THAT DEFINES ALL ELEMENTS AND HAS WELL DEFINED CHEMICAL PROPERTIES .THESE ARE COMPOSED OF THREE TYPES OF PARTICLES SUCH AS PROTONS,NEUTRONS AND ELECTRONS. https://www.youtube.com/watch?v=R1RMV5qhwyE
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