Question

What is the number of protons, neutrons, and electrons respectively in a `"zinc-70"` ion which has the symbol `"Zn"^(2+)`?

Answer 1

Well, what is the atomic number of Zinc....?

Explanation:

For `Zn`, `Z=30`..i.e. the nucleus with 30 nuclear protons is characterized as zinc... But we got `Zn^(2+)`...and this ion necessarily has 28 electrons...how many in the NEUTRAL metal? And finally we got `""^70Zn`...the superscript represents the number of nucular particles. We KNOW that the nucleus contains 30 protons....and therefore there must be 40 neutrons...(and this is one of the heavier isotopes...)

Note that were you asked this question in an exam, you would have access to a Periodic Table...and a little work on your part will render such questions trivial...