An element is a main constituent of paper,diamond and clothes etc. It forms covalent bonds with itself and other elements.
$(a)$ Identify the element.
$(b)$ Write the electron dot structure of its oxide.
$(c)$ Draw the electron dot structure of methane and ethane.

(N/A) The element is Carbon $(C)$.
$(b)$ The oxide of carbon is Carbon dioxide $(CO_2)$. The electron dot structure involves carbon sharing two pairs of electrons with each of the two oxygen atoms to complete its octet.
$(c)$ Methane $(CH_4)$ has one carbon atom bonded to four hydrogen atoms. Ethane $(C_2H_6)$ has two carbon atoms bonded to each other and to three hydrogen atoms each.