Answer:
Chemical
Explanation:
The change was chemical, because it can no longer be returned to the original form. You cannot get back the bubbles or fizz from the air.
I believe doctors use (3) Co-60 to treat ILWs. Uranium and Carbon are not used, and a different isotope of lead is used to be attached to monoclonal antibodies.
⁴⁰Ar
N(e)=18
N(p)=18
N(n)=40-18=22
⁴⁰K
N(e)=19
N(p)=19
N9n)=40-19=21
⁴⁰Ca
N(e)=20
N(p)=20
N(n)=40-20=20
