The sum of the number of neutrons and protons in the isotope of hydrogen is\

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Professor PC Thomas Classes · Answer

(b,d) : In tritium (an isotope of hydrogen with mass number 3 and atomic number 1), there are 2 neutrons and 1 proton i.e. sum $=2+1=3$. In deuterium ${ }_{1}^{2} \mathrm{D}, n+p=2$. In ordinary hydrogen ${ }_{1}^{1} \mathrm{H}, n+p=1$\