A nucleus of stable phosphorus has $15$ protons and $16$ neutrons. What is its atomic number and mass number ?

16, 31

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15, 31

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1, 15

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31, 31

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Solution

The correct option is B $15, 31$
Atomic number is equal to number of proton $= 15$
Mass number $=$ Proton $+$ neutron $= 15 + 16 = 31$

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A nucleus of stable phosphorus has 15 protons and 16 neutrons. What is its atomic number and mass number ?

The correct option is B 15,31Atomic number is equal to number of proton =15Mass number = Proton + neutron =15+16=31

A nucleus of stable phosphorus has $15$ protons and $16$ neutrons. What is its atomic number and mass number ?

The correct option is B $15, 31$
Atomic number is equal to number of proton $= 15$
Mass number $=$ Proton $+$ neutron $= 15 + 16 = 31$