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What is the behavior of the valence electrons in nitrogen triiodide?

a. All the valence electrons of the nitrogen are shared with the iodine atoms, which also share all their

valence electrons with the nitrogen atom.

b. The nitrogen atom shares one valence electron with each iodine atom, which also shares one valence

electron each with the nitrogen atom.

c. One valence electron of a nitrogen atom is transferred to each iodine atom.

d. All the valence electrons from an iodine atom are transferred to the nitrogen atom

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Answer:

b. The nitrogen atom shares one valence electron with each iodine atom, which also shares one valence  electron each with the nitrogen atom.

Explanation:

The formula of nitrogen triiodide is NI3. In this compound, the nitrogen atom shares one valence electron with each chlorine atom which in turn also shares a valence electron with nitrogen.

Recall that covalent bonding involves a sharing of valence electrons. Transfer of electrons is typical of ionic bonds between a metal and a nonmetal. nitrogen and iodine are nonmetals hence they bond covalently.

Hence, the formation of NI3 leaves three lone pairs on each chlorine atom and one lone pair on the nitrogen atom.

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