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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.