In 1974 a team of Russian scientists smashed a chromium nucleus into a lead target.Given the balanced nuclear equation,what is the new nuclide? Pb + Cr → X + n

Question

In 1974 a team of Russian scientists smashed a chromium nucleus into a lead target.Given the balanced nuclear equation,what is the new nuclide?  Pb +  Cr →  X +  n

Quizplus · Accepted Answer

The atomic number of lead (Pb) is 82 and the atomic number of chromium (Cr) is 24. The sum of the atomic numbers on the left side of the equation is 106. On the right side, there are two particles: a new nuclide (X) and a neutron (n). The sum of their atomic numbers should also be 106. The atomic number of a neutron is 0, so the atomic number of X must be 106. 
The mass number of Pb is 207, and the mass number of Cr is 52. Therefore, the mass number of X must be 207+52-1 (subtracting the neutron) = 258. 
The only option with an atomic number of 106 and a mass number of 258 is C, which is seaborgium (Sg).

In 1974 a Team of Russian Scientists Smashed a Chromium