This chapter deals with atom and itS properties. First what is an atom? Atom can be defined as the smallest particle of an element which iS considered to be undivisible.this was the definition given by scientist of old days . For example indians consider atom as paramanu which means the ultimate matter But later study found that atom can be further divided to form 35 other sub atomic particles like electrons ,protons,etc of which electrons ,protons and neutrons are considered to be the most important Electrons are considered to be negatively charged particle which was discovered by jj thomson by cathode tube experiment
Cathode ray experiment is an experiment which was first to be done by micheal faraday here a long cylindrical tube with
An anode and cathode are fixed to the two ends which iS made of metal and the other component of this experiment is a vaccum pump to pump out the excess air inside the tube
