What happens to the mass number of an element when (a) an alpha particle , (b) a beta particle , and (c) gamma radiation is emitted ?

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Solution

$(a) A l p h a p a r t i c l e c a n b e w r i t t e n a s 2^{H e^{4}} s o a f t e r a l p h a d e c a y m a s s n u m b e r w i l l g o d o w n b y 4 . (b) f o r b e t a e m i s s i o n o n e n e u t r o n p r o d u c e s o n e p r o t o n a n d a b e t a p a r t i c l e . S o m a s s n u m b e r w i l l b e s a m e a f t e r b e t a e m i s s i o n . (c) g a m m a e m i s s i o n w i l l n o t e f f e c t t h e m a s s n u m b e r . S o t h e r e w i l l b e n o c h a n g e i n m a s s n u m b e r .$

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