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Christine Chen 1H
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Joined: Fri Sep 28, 2018 12:18 am


Postby Christine Chen 1H » Fri Nov 23, 2018 12:39 pm

Why is Boron able to have 4 bonds even though it is a group 13 element?
reference: homework question 4.81 in edition 6 (B3N3H6)

Jerome Mercado 2J
Posts: 60
Joined: Tue Nov 28, 2017 3:02 am

Re: Boron

Postby Jerome Mercado 2J » Fri Nov 23, 2018 2:07 pm

Since Boron has only 5 electrons in total with 3 valence electrons, it can be an exception to the octet rule. To complete the octet, Boron can gain 5 valence electrons or lose its 3 valence electrons to complete the octet. Boron could never have a maximum 5 bonds for it is a small atom. Therefore, it can be stable with less than an octet.

In this case however, as shown in BF4-, Boron can form 4 bonds with the additional electron thus completing the octet.

The maximum amount of bonds in a period 2 element is 4 while elements in period 3 and above can form expanded octets.

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