Question

If someone tells you they have a sample of niobium-90, can you tell how many neutrons are in the nucleus?
a. Yes, there are 41 neutrons.
b. Yes, there are 90 neutrons.
c. Yes, there are 49 neutrons.
d. No, more information must be given.
e. No, there is no such thing as "niobium."

Answer

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