26 elements are man-made ..........
For the very last question you would first divide 8,900 by 12 and the number you get will be the answer. You should get 741.66
The nuclear reaction occurring is known as alpha-decay, and during this process, an alpha particle is released from a heavy radioactive nucleus to form a lighter more stable nucleus. The alpha particle is equivalent to a helium nucleus, which means it contains 2 protons and two neutrons (net charge of +2)
The decay equation is:
Rn → Po + α
Carbon oxides (monoxide, dioxide) are gases :)
