Draw the electron dot structures for
$(a)$ propanone
$(b)$ $F_2$

(N/A) Propanone: The chemical formula of propanone is $CH_3COCH_3$. In this structure,the central carbon atom is double-bonded to an oxygen atom and single-bonded to two other carbon atoms. Each of these two carbon atoms is further bonded to three hydrogen atoms.
(Image provided in the original context shows the electron sharing between atoms.)
$(b)$ $F_2$: Fluorine has $7$ valence electrons. To achieve a stable octet,two fluorine atoms share one pair of electrons,forming a single covalent bond.