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प्रश्न
A radioactive nucleus undergoes a series of decays according to the sequence
\[\ce{X->[β] X1->[α] X2->[α]X3}\]
If the mass number and atomic number of X3 are 172 and 69 respectively, what is the mass number and atomic number of X?
एका वाक्यात उत्तर
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उत्तर
Mass no. of X = 180
Atomic no. of X = 72
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