5. The volcanic eruption of Mt. St. Helens in the state of Washington in 1980 produced a considerable quantity of a radioactive element in a gaseous state. Atoms in the radioactive substance had 86 protons.

5. The volcanic eruption of Mt. St. Helens in the state of Washington in 1980

produced a considerable quantity of a radioactive element in a gaseous
state. Atoms in the radioactive substance had 86 protons. Which was it?

Rubidium
Bromine
Polonium
Radon

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5. The volcanic eruption of Mt. St. Helens in the state of Washington in 1980 produced a considerable quantity of a radioactive element in a gaseous state. Atoms in the radioact…

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