What is the daughter nucleus (nuclide) produced

Question

What is the daughter nucleus (nuclide) produced when 211^Pb undergoes beta decay by emitting an electron? Replace each question mark with the appropriate integer or symbol.

daughter nucleus (nuclide): ?

Answer 1

By losing an electron (negative charge), the atomic number increases by one, but atomic mass doesn't change. The atomic number one more than Pb is bismuth (Bi), so the daughter nuclide is

daughter nucleus (nuclide): Bi^211