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There are 15 protons and 16 neutrons in the nucleus of an element. Calculate its atomic number and mass number. 

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Atomic number of any element is the number of proton present in that atom 

Here, number of proton = 15 therefore atomic number is also 15. 

Mass number or atomic mass is the sum of proton and neutron. 

Therefore mass number = 15 + 16 = 31

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