Question- If the radioactive decay of a nucleus has a half-life of 4.20 min, how many atoms are left after 3.00 × 102 seconds if there are 5.00 × 1022 atoms to start?
a) 3.46 × 109 atoms
b) 2.19 × 1022 atoms
c) 15.9 atoms
d) 3.94 atoms
Illustrate structures to prove your interpretation.