Important Questions on Structure of the Atom
Name three subatomic particles of an atom. 
Why atom is considered as neutral particle? Write the distribution of electrons in sodium and chlorine atom. If K,L and M shells of an atom are full then what would be total number of electrons in the atom ? How will you find valency of sodium, chlorine and argon ? Give reason why Ernest Rutherford selected gold foil for his experiments ? Give reason why Ernest Rutherford got unexpected results from his experiment? Give reasons why those atoms show little chemical reactivity who have their outermost shell completely filled? 
