3. Draw the atomic structure of a sulfur atom and a sulfide ion....explain why you draw it this way.

Atomic structure of sulfur atom :














Atomic structure of sulfide ion :














Explanation :
Sulfur atom have 16 electrons ,thus we have to draw 3 rings around the word"S" and the "x" on each of the ring. The "S" which is the word at the center of the ring is the atom/element.The rings represents electron shells and the "x" represents the electrons. The first ring are only allowed to have a maximum of 2 electrons. While the others can be drawn up to 8 maximum. Sodium atom have 16 electrons, which means we have to draw 3 rings and 16 "x" . Easier explanation is by following the electronic configuration. Sulfur atom electronic configuration is [2.8.6]. The first number represent the first ring, second number is the second ring. The number represent the number of electron on that ring.
Sulfide ion have 18 electrons, thus we have to draw 3 rings and 18 "x". Another word is 3 electron shells and 18 electrons. The reason why it only have 18 electrons because it is to make it stable. To be stable, it's valance shell have to reach the maximum number of electron. For sulfide ion to be stable, it need to gain 2 electron.