Explanation:
Cu, Na and Nd are all elements.
A compound consists of at least 2 different elements.
Calcium chloride (CaCl2) consists of calcium and chlorine atoms, therefore it is a compound.
Answer:
0.03127 fraction of a sample of this nuclide would remain after 12.5 hrs.
Explanation:
Initial mass of the isotope =
Time taken by the sample, t = 12.5 hour
Formula used :
where,
= initial mass of isotope
N = mass of the parent isotope left after the time, (t)
= half life of the isotope = 2.5 hour
= rate constant
Now put all the given values in this formula, we get
0.03127 fraction of a sample of this nuclide would remain after 12.5 hrs.