Answer the following in one line or one word:
(a) Who discovered neutron ?
(b) On the basis of Thomson's model of an atom, explain how the atom is neutral as a whole.
(c) What is the maximum number of electrons that can be accommodated in the outermost shell of an atom ?
(d) What term is assigned to the atoms of different elements having same atomic mass but different atomic numbers.
(e) How many neutrons are present in a hydrogen atom?