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131.

An element A has the configuration 1s²2s²2p⁶3s¹ while the configuration of B is 1s²2s²2p⁵. What type of bond is likely to be formed between them?

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132.

Discuss the Lewis concept of the covalent bond formation.

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133.

Write the Lewis dot structure of molecule.

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134. Write the Lewis structure of nitrite

space space NO subscript 2 superscript minus

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135.

What do you understand by formal charge (F.C.) on atom in a molecule/ion?

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136.

Calculate the formal chrage on each O-atom of O₃ molecule.

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137.

What is the importance of calculating the formal charges?

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138.

Calculate the FormalCharge on atoms in carbonate ion ?

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139.

What do you understand by bond pairs and lone pairs of electrons? Illustrate by giving one example of each type.

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140. What are the drawbacks of Lewis concept of bonding?

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