Friday

January 30, 2015

January 30, 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

**Answer this Question**

**Related Questions**

Physical Science - 1. Which equation correctly shows beta decay? (A) 210/82 Pb...

Chemistry - Uranium-238 has half life of 4.51 * 10^9 years Uranium-234 has half ...

Physics - Suppose you have 100 g of radioactive plutonium-239 with a half-life ...

Physics - Suppose you have 100 g of radioactive plutonium-239 with a half-life ...

Science - How much of a radioactive material with a half-life of 12,000 years is...

science - suppose you have 100grams of radioactive plutonium-239 with a half-...

Chemistry - Po-210 Ia an alpha emitter with a half-life of 138 days. how many ...

Math - D.E.Q. - The half-life of a radioactive isotope is the amount of time it ...

physical science - If you have 24 grams of an unstable atom with a half life of ...

physical science - If you have 24 grams of an unstable atom with a half life of...