which element has 16 protons, 17 neutrons, and 16 electrons?

Look on the periodic table. It is element number 16 since that is the number of protons and electrons.

I know sulphur has 16 of each. However, it might be an isotope of sulphur to have 17 neutrons.

http://www.chemicalelements.com/elements/s.html

I hope this helps. Thanks for asking.