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Untitled - Kelly Walsh High School

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134 CHEMISTRY FOR THE UTTERLY CONFUSED<br />

Quick Tip<br />

Quick Tip<br />

Quick Tip<br />

First, write a general framework for the molecule. In this case, the carbon bonds<br />

to the oxygen since hydrogen can only form one bond.<br />

Hydrogen is never the central atom.<br />

Normally the atom needing the greater number of electrons to achieve an octet<br />

is the central atom. If two atoms need the same number of electrons, the larger<br />

is usually the central atom.<br />

Carbon usually forms four bonds, hydrogen forms one bond, and oxygen generally<br />

forms two bonds.<br />

In order to determine where to place the electrons, we will apply the N-A S<br />

rule<br />

where<br />

H<br />

H C O H<br />

H<br />

N sum of valence electrons needed for each atom. The two allowed<br />

values are 2 for hydrogen and 8 for all other elements.<br />

A sum of all available valence electrons<br />

S no. of electrons shared and S/2 no. of bonds

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