I think its 2-, it gained 2 electrons.
The answer to this question is 45
The amount of product obtained in a chemical reaction. The absolute yield can be given as the weight in grams or in moles.
After a radioactive atom decays, it is the same element that it
was before with no measurable change in mass. the decay that is present is
gamma decay because gamma decay has photons which has no mass unlike alpha and
beta decay.