Chemistry - Hydrogen and Its compound Question with Solution | TestHub

Hydrogen has three isotopes$\left(\mathrm{A}\right), \left(\mathrm{B}\right)$and$\left(\mathrm{C}\right).$If the number of neutron(s) in$\left(A\right), \left(B\right)$and$\left(\mathrm{C}\right)$respectively, are$\left(\mathrm{x}\right), \left(\mathrm{y}\right)$and$\left(\mathrm{z}\right),$the sum of$\left(\mathrm{x}\right), \left(\mathrm{y}\right)$and$\left(\mathrm{z}\right)$is