16 Lewis Structures, Bond Length &amp; Rigidity

# 16 Lewis Structures, Bond Length &amp; Rigidity - Which...

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1 Which is the most likely bonding framework for methanol, CH 4 O? A) C) H H H C O H O C H H H H H C O H H H B) H can not be in the center because it only forms 1 bond O is the most electronegative so it should be on the outside C should be in the middle O doesn’t have 3 bonds, C should have 4 bonds Formal charge on each atom should be 0 Structural formula would make it easy: CH 3 OH O C H H H H D) The seven-step strategy for writing Lewis Structures 1) Count the number of valence electrons. Use the Group number as a guide. 2) Decide which atoms are bonded to each other, connect them by a single line to represent a bonding electron pair. Consider H, electronegativity, the molecular formula. 3) Place lone pairs around the atoms to satisfy the octet rule. Start on the outer atoms, proceed until all atoms have an octet or all electrons are used. 4) Place any leftover electrons on a central atom even if the octet rule is violated. Central atom needs to be in Period 3 or higher.

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2 3 5) If a central atom has fewer than 8 electrons, use a nonbonding pair to form double or triple bonds to that atom.
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