Based solely on the fact that, for elements beyond Bi-209 all nuclei are unstable and radioactive, we can conclusively determine that
A) in order to be radioactive, an element must have a mass of at least 210
B) polonium-210 is radioactive, but polonium-208 and polonium-209 are not radioactive
C) both uranium-235 and uranium-238 are radioactive
D) phosporus-32 and sulfur-35 are not radioactive
E) lead does not have radioactive isotopes
Correct Answer:
Verified
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B)
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