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OpenStudy (anonymous):
Which of these metals is radioactive? a. rubidium b. francium c. potassium d. lithium
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OpenStudy (anonymous):
b
OpenStudy (anonymous):
why
OpenStudy (anonymous):
no it's a) I was wrong before
thomaster (thomaster):
Francium is radioactive so the answer is B Radioactive rubidium isotopes have a half-life 3 times longer than than the age of the universe so i wouldn't call it radioactive. Francium is definitely radioactive.
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