The radioactive decay of uranium -238 in the earth's crust produces radioactive radon gas Rn-222 which escapes into the atmosphere is one common cause of background radiation.
Answer:
30 centimeters
Explanation:
I really hope you meant centimeters or I'm gonna look pretty dumb
The valency of an atom is equal to the number of electrons in the outer shell if that number is four or less. Otherwise, the valency is equal to eight minus the number of electrons in the outer shell. Once you know the number of electrons, you can easily calculate the valency.
<span>Infant mortality dropped significantly - raising the average age at death. It depends on how you look at the statistics. </span>
Answer:
solar flair I think I'm not sure
