Answer:
Uranium mines operate in many countries, but more than 85% of uranium is produced in six countries: Kazakhstan, Canada, Australia, Namibia, Niger, and Russia. Historically, conventional mines open pit or underground were the main source of uranium.
Explanation:
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The answer 1) Oxygen. And another smallest radius is fluorine, because it is the first in the periodic table.
Answer:
Any element in group 18 has eight valence electrons (except for helium, which has a total of just two electrons
(4) slate because it is the strongest
