The Lewis dot structures can be written according to the following steps:
The total number of electrons required for writing the structures is obtained by adding the valence electrons of the combining atoms.
For anions, add one electron for each negative charge and for cations, subtract one electron for each positive charge from the total number of valence electrons.
Distribute the total number of electrons as bonding shared pairs between the atoms in proportion to the total bonds.
Place the most electropositive atom at the central position in the molecule/ion.
After accounting for the shared pairs of electrons for single bonds, the remaining electron pairs are either utilized for multiple bonding or remain as the lone pairs.
All the atoms should satisfy octet rule in the Lewis structure
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