Question

Question 4.3 Write Lewis symbols for the following atoms and ions:

S and S2–; Al and Al3+; H and H–

Class XI Chemical Bonding and Molecular Structure Page 129

Answer 1

Steps for writing Lweis dot symbol :
write the electronic configuration of each element to find the number of valance electrons .e.g electrons present in outer most orbit.

Represent the valance electrons by dots around the symbol of the element.

₁₆S , configuration = 2, 8, 6
Hence, valance electrons 6.

S²⁻, configuration = 2, 8, 8
Hence, valance electrons = 8

₁₃Al, configuration = 2, 8, 3
Hence, valance electrons = 3

Al³⁺, configuration = 2, 8
Hence, valance electrons = 0

₁H, configuration = 1
Hence, valance electron = 1

H⁻, configuration = 2
Valance electrons = 2

See attachment.

Answer 2

Answer:- Lewis symbol =: S: s2-% 3D = 2, 8, (Z = 16) Lewis symbol = [$: Al = 2, 8, 3 (Z = 13) Lewis symbol = · Ả • Al³ * = 2, 8 A13 + ion = [Al] 3+ (Z = 13) H = I Lewis symbol = H (Z - 1) H = 2 Lewis symbol [H-] (Z = 1)