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A nucleus of stable phosphorus has 15 pr...

A nucleus of stable phosphorus has 15 protons and 16 neutrons.
(a) What is its atomic number and mass number ?
(b) The nucleus of radio phosphorus has one neutron more than the stable nucleus. What will be its atomic and mass number ?
(c ) What will be the atomic number and mass number of new nucleus formed by the decay of a `beta`-particle by the radio phosporus in part (b) ?

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atomic number = 15. mass number = 31
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