Answer:
I will!
Explanation:
Friends are always a good thing to have.
This is a relatively easy half-life problem.
Whenever a half-life has expired, one half of the radioactive isotope will no longer be present.
When 2 half-lives have occurred, then one quarter of the isotope remains.
Therefore, the strontium - 90 will be at a safe level in 54 years.
C. Magnesium and Calcium is my best guess because they are in the same group or family and they are in the <span>alkaline earth metals.</span>
Answer:
definately substance A beacause its the lowest ph leval which means its more acidic
Explanation: