Explanation:
I don't know sorry ok I have some work so I m sorry
The answer is b. radon-222. The alpha decay means that it will emit an alpha particle when decays. The alpha particle has two protons and two neutrons. So Radium(88) minus two protons will become Radon(86). And the atomic mass will become 226-4=222.
Chemistry affects all aspects of life and most natural events because all living and nonliving things are made of matter.