http://answers.yahoo.com/question/index?qid=20081007173812AAlybKT

Q: Which element, isotope, or ion has 33 neutrons and 27 electrons and how do you know?
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Best Answer – Chosen by Voters
ibuprofen
commonly known as advil

Source(s):
chemist for 27 years
majored at university of michigan

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The funny thing is, the actual answer was the first real response:

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it is cobalt-60.
in order to find this:

the number of electrons in an atom = the number of protons
thus, since this isotope has 27 electrons, it also has 27 protons. The number of protons in an element is always constant. The element with the atomic number of 27 is cobalt.
in a ‘normal’ element, the number of protons usually equals the number of neutrons; however, when it does not an isotope forms.
thus the atomic mass is 33+27 = 60

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I hope if I’m a chemist for 27 years, I’ll know that Ibprofen isn’t an isotope, an element (its a composition of), nor is it an ion.