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November 23, 2014

Homework Help: Chemistry

Posted by Derrick on Monday, July 19, 2010 at 8:17pm.

What is used to tell different isotopes of a particular element apart?

A. the mass number
B. the atomic number
C. the number of protons
D. the number of electrons

A is the answer.

After how many half-lives are there equal amounts of parent and daughter isotopes.

A 1
B 2
C 3
D 4

The answer is A.

The half life of Ni-28 is six days. What fraction of a sample of this isotope will remain after 18 days?

A 1/2
B 1/4
C 1/8
D 1/16

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