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An atom wants to have a full octet and thus the number of valence electrons is the key to finding how many bonds should be formed to complete this octet.

For example: H2O

Oxygen has 6 valence electrons. To achieve a full octet (i.e. eight valence electrons on the outermost shell), it needs two more electrons. Hydrogen has 1 electron available for bonding, thus two hydrogen atoms would provide oxygen with the two electrons it needs. Thus the compound, H2O is formed.


Another example is CO2

Carbon has 4 valence electrons. Oxygen has 6. Each wants a full octet. Thus, carbon shares two of its valence electrons with each oxygen. In the end, Carbon has its original 4, plus two from each oxygen atom, which totals to eight. Oxygen has 6 originally plus 2 shared electrons from carbon thus a full octet is achieved.

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11y ago
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13y ago

If its' valence shell is full. If it isn't then it will bond with other atoms until it has a full valence shell.

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16y ago

it needs altogether 13 electrons more

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Q: Explain how to use the valence electrons in an atom to predict if the atom will form bonds.?
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