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1). A radioactive compound cobalt-60 has a half-life of 527.0 years. What will be the amount remaining in a 100.0-g sample after 15.816.0 years?

2).An 80.0-g sample of a radioactive compound,radium-266, is reduced to 5g in 28 years. What is the half-life of the compound?

3).How many significant digits are there in 6.023x10^23 molecules?

4). Write the shorthand form of the electron configuration for sodium.

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Answer #1

correction on #4…

Na: [any] 3s1

Answer #2

I don’t like working with formulas, but here is a link to help you with 1 & 2

http://en.wikipedia.org/wiki/Half-life

the next two are pretty simple:

  1. 4
  2. Na: [N e] 3s1
Answer #3

You can find all Chemistry homework help at tutorvista.com they will solve your question and will show how to do the rest.

here’s the link just in case you need it

http://funadvice.com/r/15e7e4fvbd7

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