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NCERT Class XI Chemistry Solutions

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Question : 14 of 40
Marks: +1, -0
Use Lewis symbols to show electron transfer between the following atoms to form cations and anions : (a) K and S (b) Ca and O (c) Al and N.
Solution:  
(a) K+K^{+} 2 , 8 , 8 , 1 ; K+K^{+} 2 , 8 , 8 , 1 + S....:\overset{..}{\underset{..}{\mathrm{S}}}: 2 , 8 , 6 → K+K+[:S....:]2−K^{+} K^{+} \left[:\overset{..}{\underset{..}{\mathrm{S}}}:\right]^{2-} or K2S\mathrm{K}_2\mathrm{S}
(b) Ca:\mathrm{Ca}: 2 , 8 , 8 , 2 + O....:\overset{..}{\underset{..}{\mathrm{O}}}: 2 , 6 → Ca2+[:O....:]2−\mathrm{Ca}^{2+} \left[:\overset{..}{\underset{..}{\mathrm{O}}}:\right]^{2-} or CaO
(c) .Al:+N...:.\mathrm{Al}: + \overset{.}{\underset{..}{\mathrm{N}}}: 2 , 5 → Al3+[:N....:]3−\mathrm{Al}^{3+} \left[:\overset{..}{\underset{..}{\mathrm{N}}}:\right]^{3-} or AlN
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