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Question
Use Lewis symbols to show electron transfer between the following atoms to form cations and anions:
Ca and O
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Solution 1
Ca and O:
The electronic configurations of Ca and O are as follows:
Ca: 2, 8, 8, 2
O: 2, 6
Oxygen requires two electrons more to complete its octet, whereas calcium has two electrons more than the nearest noble gas i.e., Argon. Hence, the electron transfer takes place as:
Solution 2
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Answer in one sentence:
Covalent bond is directional in nature. Justify.
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Match the items given in Column I with examples given in Column II.
| Column I | Column II |
| (i) Hydrogen bond | (a) \[\ce{C}\] |
| (ii) Resonance | (b) \[\ce{LiF}\] |
| (iii) Ionic solid | (c) \[\ce{H2}\] |
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| (e) \[\ce{O3}\] |
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