# A neutral atom containing ten negative charges is what element?

$\text{The element is neon.........}$
If there are 10 negative charges, 10 electrons, there MUST be 10 positive charges, 10 protons, associated with the neutral atom. Why $\text{must}$? And if there are 10 fundamental positive charges then $Z = 10$, you look at your Periodic Table, and you find for $Z = 10$, we have $\text{neon}$, an inert gas.
Note that you must learn to use the Periodic Table like this. What about $Z = 12$, $Z = 27$, $Z = 92$. Which elements do we specify? An examiner could equally ask the identity of a singly negatively charged ion, ${X}^{-}$, with 10 or 18 electrons. Which elements do we specify?