Answer:
19 gram
Step-by-step explanation:
Formula of mass left after ionising: [tex]\frac{M}{2^{n} }[/tex] where M is original mass and n is half lives.
Using the equation:
[tex]\frac{150}{2^{3} }[/tex] → 18.75
Therefore, 18.75 g left after ionising.
∵ If rounded to nearest gram then 19 gram.
