Question

Which missing item would complete this alpha decay reaction?

Answer 1

an atom with atomic number 98 and atomic weight 253

Answer 2

Aleighty I think i got it,what about What percentage of a radioactive species would be found as daughter material after five half-lives?

Answer 3

After 1 half life you would have 50%, after two, 25%... etc.

Answer 4

Right fraction = (0.5)^n after n half-lives.

% = 100 times fraction, of course.