Protons, the number of protons cannot change or the element will change as well.
Answer:
vineger
Explanation:
homogeneous mixture cannot be separated pyhsically
Answer:
24.5
Explanation:
15/6.3 => 2.38 half lives passed.
.5^2.38 => 0.19198 decimal representation of the percentage that is left over after 2.38 half lives have passed.
0.19198 *128 = 24.5 mg of the material remaining.
