The net charge on a sulfide ion, #"S"^(2-)#, is #2-#. How does this ion obtain its charge?

1 Answer
Nov 6, 2016

Answer:

A neutral sulfur atom gains #2# electrons.

Explanation:

An ion can only be formed when a neutral atom gains or loses electrons.

Since electrons carry a negative charge, gaining electrons will result in the formation of a negatively charged ion, or anion. Similarly, losing electrons will result in the formation of a positively charged ion, or cation.

In your case, the sulfide anion, #"S"^(2-)#, carries a #(2-)# negative charge, which can only mean that it gained electrons.

More specifically, it gained #2# electrons. A neutral sulfur atom has an atomic number equal to #16#, which means that it has #16# protons inside its nucleus and #16# electrons surrounding its nucleus.

For each electron gained, the ion's overall charge decreases by #1# unit, which further confirms the fact that the neutral sulfur atom gained #2# electrons to get the #(2-)# charge.

http://3e5-chemistry-39-2011.blogspot.ro/2011_07_01_archive.html