The given table shows the sub-atomic particles of six particles, represented by the letters P to U .
( The letters are not the actual symbols of the particles . )

(a) Find the particles which can be
(i) noble gases.
(ii) positive ions.
(iii) negative ions.
(b) Which two particles are an atom and an ion of the same element?
(c ) (i) Which particle is the lightest ?
(ii) Which particle is the heaviest?

Explanation

(a) (i) Q (ii) S and U (iii) P and T (b) R and S
(c ) (i) Q and (ii) R )