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Question 6.4: CHEMICAL REACTIONS AND THE OCTET RULE Lithium metal reacts w...

CHEMICAL REACTIONS AND THE OCTET RULE

Lithium metal reacts with nitrogen to yield Li_{3}N. What noble-gas configuration does the nitrogen atom in Li_{3}N have?

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The compound Li_{3}N contains three Li^+ ions, each formed by loss of a 2s electron from lithium metal (group 1A). The nitrogen atom in Li_{3}N must therefore gain three electrons over the neutral atom, making it triply negative (N^{3-}) and giving it a valence-shell octet with the neon configuration:

N configuration: (1s²2s²2p³)             N^{3-} configuration: (1s^{2}2s^{2}2p^{6})

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