I think it’s tissue I just did it
The half-life of Plutonium−239, t1/2 is 2.41 × 10⁴<span> yrs
time taken to reach tolerable level = seven half-lives
= 7 x t1/2
= 7 x </span>2.41 × 10⁴ yrs
= 168700 yrs
= 1.687 x 10⁵ yrs
Hence, the period of time that <span>Plutonium-239 must be stored is </span>1.687 x 10⁵ years.
Answer:
1. If an atom of calcium has a mass of 40:
a. Protons =
20
b. Neutrons =
20
2. If an atom of krypton has a mass of 84:
a. Protons =
36
b. Neutrons =
48
3. If an atom of tin has a mass of 119:
a. Protons =
50
b. Neutrons =
69
4. If an atom of tungsten has a mass of 184:
a. Protons
= 74
b. Neutrons =110
its all of them and that on period
Answer:
Hi im an online tutor and I can assist you with all your assignments. we have professionals in all fields. Check out our website https://toplivewriters.com
Explanation:
