Which of the following statements is/are true?
i. Kössel and Lewis in 1916 developed an important theory of chemical combination between atoms known as the electronic theory of chemical bonding.
ii. According to the electronic theory, atoms can combine either by transfer of valence electrons from one atom to another (gaining or losing) or by sharing of valence electrons in order to have an octet in their valence shells.
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A.
Only i
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B.
Both i and ii
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C.
Neither i nor ii
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D.
Only ii
Correct Answer:
B. Both i and ii
Explanation:
The electronic theory of chemical bonding, introduced by Kössel and Lewis in 1916, explains how atoms interact to achieve stability. According to this theory, atoms are most stable when they have a complete octet (eight electrons) in their outermost or valence shell, similar to the electron configuration of noble gases. To reach this state, atoms can either transfer valence electrons from one atom to another, resulting in ionic bonds, or share valence electrons between atoms, resulting in covalent bonds. Since both statements correctly describe the origins and mechanisms of the electronic theory of chemical bonding, both i and ii are true.
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