Octet Rule Exceptions

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Adam Kramer 1A
Posts: 103
Joined: Sat Aug 24, 2019 12:15 am

Octet Rule Exceptions

Postby Adam Kramer 1A » Tue Oct 29, 2019 9:14 pm

Is there an easy way to determine if there is an octet rule exception for a given atom? How can we tell just by looking at the periodic table which atom can have more than 8?

Sophia Shaka 3L
Posts: 57
Joined: Wed Sep 18, 2019 12:20 am
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Re: Octet Rule Exceptions

Postby Sophia Shaka 3L » Tue Oct 29, 2019 10:24 pm

Atoms in the first two groups must follow the octet rule. The octet rule really applies to those atoms with atomic numbers below 20, because they want the configuration of a noble gas.

Fatemah Yacoub 1F
Posts: 114
Joined: Thu Jul 11, 2019 12:16 am

Re: Octet Rule Exceptions

Postby Fatemah Yacoub 1F » Wed Oct 30, 2019 1:50 pm

If the atom is in a n=3 shell or higher and has an empty d orbital (elements in the p block) it will be able to expand its octet.

Posts: 90
Joined: Sat Sep 07, 2019 12:15 am

Re: Octet Rule Exceptions

Postby 005321227 » Thu Oct 31, 2019 10:22 pm

The octet rule mainly only applies to atoms with less electrons. As the atomic number increases, the atom is more capable of having more than an octet.

Alexa Mugol 3I
Posts: 54
Joined: Sat Aug 17, 2019 12:17 am

Re: Octet Rule Exceptions

Postby Alexa Mugol 3I » Fri Nov 01, 2019 11:29 am

Elements in n=3 or higher can expand their valence shell because it has open d orbitals. So pretty much, an easy way to tell if there's an octet rule exception is if there are open d orbitals in a given atom. n=2 elements cannot expand their valence shell because n=2 does not have any d orbitals. n=3,4,... have d orbitals so exceptions are okay.

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