After three half-lives of an isotope 1 billion of those isotopes remain undecayed. How many atoms were in the original sample?
1 answer:
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The symbol is for phosphorus having atomic number 15. That means it has
in its neutral state.
The given symbol has a -3 charge that means it has gained 3 electrons so, the number of electrons in the
is:
. The number of protons will remain same that is the number of protons = 15.
So, the ion has
that gives
charge on the
ion.
So, the answer is .