WBBSEClass XPhysical ScienceIonic and Covalent Bond01 Mark2022 Easy

QQuestion

For which of the following ionic compounds no ion has octet?

(a) LiH

(b) CaO

(c) NaCl

(d) MgCl2

Exam-ready answer 01 Mark

Answer

(a) LiH

Explanation: In lithium hydride (LiH), lithium (Li) has only 2 electrons in its outer shell after bonding (duplet), and hydrogen (H) also has 2 electrons (which is a complete shell for it). Thus, neither ion achieves an octet configuration. In the other compounds, the ions achieve an octet configuration.

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