In the electronic structure of acetic acid $(CH_3COOH)$,there are:

Identify the option$(s)$ which contain correct statements.

Define the octet rule. Write its significance and limitations.

Among the following molecules,the $N-Si$ bond length is shortest in:

What are the similarities and differences in the Lewis structures of $H_2SO_4$ and $SO_4^{2-}$?

Fill in the blanks given below:
$(i)$ The attractive force which holds atoms,molecules,and ions together is called ......... .
$(ii)$ First of all,............ and ............ scientists provided detailed information about valency.
$(iii)$ In the structure of an atom,when only the electrons of the outermost shell participate,they are known as ............ .
$(iv)$ The symbol used to represent valence electrons in an atom is called ........ .