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February 28, 2015

February 28, 2015

Posted by **c** on Thursday, June 20, 2013 at 9:38pm.

- Chemistry H -
**DrBob222**, Thursday, June 20, 2013 at 11:05pmThe long way.

k = 0.693/t_{1/2}

ln(No/N) = kt

No = 60

N = solve for N.

k from above.

t = 250,000

First number is atomic number. Second number is mass number.

90Th210 ==> -1e0 + 91Pa210

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