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Published byStephen Flynn Modified over 5 years ago
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Drawing Lewis Dot Structures for Ionic Compounds
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Ionic Bonding involves: TRANSFER of valence e- from metal atom to non-metal atom:
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2 step process: 1) transfer of e- from metal to non-metal atoms result: +/- IONS form 2) electrostatic attraction between +/- ions result: ionic bond forms
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[Na]+1[ Cl ]-1 NaCl • • • • • • • •
remember: Lewis diagrams show valence electrons!
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Predicting Ionic Compounds
What is the ionic compound formed from calcium and iodine? calcium: metal with 2 valence electrons - loses both electrons [Ca]+2 iodine: non-metal with 7 valence electrons - gains 1 electron [ I ]-1 •• • • • • •• how many iodine ions are needed to make a neutral compound? 2
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Lewis Diagram of calcium iodide (CaI2)
[Ca]+2[:I:]-1[:I:]-1 or [:I:]-1[Ca]+2[:I:]-1 note: total charge MUST add up to zero since compounds are neutral ·· ·· ·· ·· ·· ·· ·· ··
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