Radioactivity in our world <span>b. is as old as the universe.
</span><span>Radioactive atom spontaneously emits energetic particles or waves, while decays on lighter nuclei (atoms with smaller atomic mass). Radioactivity is used to calculate how old is Earth and living things, for that purpose isotope of carbon is used.</span>
Answer:
The electron configuration for a
Mn3+ ion is [Ar]3d4
Explanation:
11. D
12.C
13. For 13 i would say B but not so sure
14. A
Options if it’s true or false true
