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ICSE Class 10 Chemistry 2020 Paper

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Draw the electron dot diagram for the compounds given below. Represent the electrons by (.) and ( xx ) in the diagram.
[Atomic No. : Ca=20,O=8,Cl=17,H=1\mathrm{Ca}=20, \mathrm{O}=8, \mathrm{Cl}=17, \mathrm{H}=1 ]
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Question : 43 of 86
Marks: +1, -0
Calcium oxide
Solution:  
Calcium oxide −CaO-\mathrm{CaO}
  Ca=20=2,8,8,2\; \mathrm{Ca}=20=2,8,8,2
  O=8=2,6\; \mathrm{O}=8=2,6
Ca−2e−→Ca2+\mathrm{Ca} - 2 e^{-} \rightarrow \mathrm{Ca}^{2+}
O+2e−→O2−\mathrm{O} + 2 e^{-} \rightarrow \mathrm{O}^{2-}
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