The formal charge on the central oxygen atom in ozone $(O_3)$ is:

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 ........ .

In the reaction $AlCl_3 + Cl^- \rightarrow [AlCl_4]^-$,$AlCl_3$ acts as a.......

In which of the following pairs is the geometry around the central atom not the same?

Which of the following compounds $CANNOT$ act as a Lewis base?

Which one of the following is a Lewis acid?