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    I thought of using R=(1.2X10^-15)A^1/3 equation but I don't know how to find the area. I know A=pi r^2 but I don't know r.
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    (Original post by Airess3)
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    I thought of using R=(1.2X10^-15)A^1/3 equation but I don't know how to find the area. I know A=pi r^2 but I don't know r.
    Right idea, but A is the Atomic mass number (number of protons + neutrons) in that equation, not the area of a circle. Put in A=197 and you should get the right answer.
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    (Original post by __Adam__)
    Right idea, but A is the Atomic mass number (number of protons + neutrons) in that equation, not the area of a circle. Put in A=197 and you should get the right answer.
    Thanks!
 
 
 
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