Question 12
How does a Lewis structure differ from a Lewis dot structure of the same molecule?
The right answer is the one marked above.
Each bonding pair is drawn as a short line instead of two dots. That separates the pairs doing the bonding from the pairs that are not, at a glance.
Lone pairs are kept, still as dots — losing them would hide part of the molecule. Every atom is drawn in both notations, and crosses belong to the dot-and-cross diagram, which is a third notation again.