Q. 18

# Write Lewis structure of the following compounds and show formal charge on each atom.

HNO_{3}, NO_{2}, H_{2}SO_{4}

Answer :

Formal charge = valence electrons- (lone pair electrons + 1/2 bounded electrons)

(i) Formal charge calculations:

For N: 5 – 1/2 (8) = +1

For O: 6 – 6 – 1/2 (2) = -1

(ii) Formal charge calculations:

For N: 5 – 1/2 (8) = +1

For O without H: 6 - 6 - (1/2)2 = -1

For O without H on left side of N:6-4-1/2 (4)= 0

For O with H: 6 - 4 - (1/2)4 = 0

(iii) Formal charge calculations:

For S: 6 - (1/2)8 = +2,

For O without H: 6 - 6 - (1/2)2 = -1,

For O with H: 6 - 4 - (1/2)4 = 0.

Rate this question :

The skeletal structure of CH_{3}COOH as shown below is correct, but some of the bonds are shown incorrectly. Write the correct Lewis structure for acetic acid.

NCERT - Chemistry Part-I

Write Lewis dot symbols for atoms of the following elements: Mg, Na, B, O, N, Br.

NCERT - Chemistry Part-IExplain why BeH_{2} molecule has a zero-dipole moment although the Be–H bonds are polar.

Define octet rule. Write its significance and limitations.

NCERT - Chemistry Part-I