question_answer

Which of the following statement is true         [MP PET 1993]

A)            \[_{78}P{{t}^{192}}\] has 78 neutrons

B)            \[_{84}P{{o}^{214}}{{\to }_{82}}P{{b}^{210}}+{{\beta }^{-}}\]

C)            \[_{92}{{U}^{238}}{{\to }_{90}}T{{h}^{234}}{{+}_{2}}H{{e}^{4}}\]

D)            \[_{90}T{{h}^{234}}{{\to }_{91}}P{{a}^{234}}{{+}_{2}}H{{e}^{4}}\]