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Elyssa Smith 4B
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Joined: Wed Sep 18, 2019 12:22 am


Postby Elyssa Smith 4B » Fri Nov 01, 2019 4:46 pm

Can someone explain radicals and how they fit into octet exceptions?

Posts: 74
Joined: Sat Sep 07, 2019 12:19 am

Re: radical

Postby AGulati_4A » Fri Nov 01, 2019 5:10 pm

Radicals are just compounds or molecules that are not in their most stable form. This means that they do not have all of their valence electrons paired yet and thus are unstable. A good example of this is CH3, which is produced by incomplete combustion. This molecule of CH3, unlike methane (ch4), has two unpaired electrons. radicals are also different from ions such as OH-, which doesn't have any unpaired electrons as it is ionized. These radicals can be DNA or protein damaging as the unpaired electrons can bind to the DNA structure and destroy specific shape of the molecule. We often refer to DNA damage with the example fo the methylation of DNA which basically refers to ch3 molecules binding to DNA to prevent replication and transcription. This is also why we would require more vitamins, and especially anti-oxidants which take away the lone pairs of electrons from these radicals.

Anna Wu 1H
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Joined: Sat Aug 17, 2019 12:16 am

Re: radical

Postby Anna Wu 1H » Fri Nov 01, 2019 5:20 pm

Free radicals fit into the octet rule because they are unpaired and thus, do not fit the octet or 8 valence electron standard.

Junwei Sun 4I
Posts: 125
Joined: Wed Oct 02, 2019 12:16 am

Re: radical

Postby Junwei Sun 4I » Fri Nov 01, 2019 9:27 pm

Radicals are simply compounds with unpaired electrons. Radicals are exception of the octet rule because a radical might not have a filled octet with 8 electrons. For example Dr. Lavelle talked about CH3 in class. When we draw out the lewis structure for CH3, the central atom C have 7 valence electrons, which violates the octet rule of having 8 valence electrons. Radicals are highly reactive since they are not in the most stable form.

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Joined: Wed Sep 18, 2019 12:18 am

Re: radical

Postby salvadorramos3k » Sun Nov 03, 2019 12:28 am

Radicals are basically molecules that have at least one unpaired electron, making them less stable than other molecules that have, for example, a completed octet.

Sean Sugai 4E
Posts: 56
Joined: Wed Sep 11, 2019 12:17 am

Re: radical

Postby Sean Sugai 4E » Sun Nov 03, 2019 5:40 pm

The octet rule is a general rule of thumb, stating that each atom seeks to have eight valence electrons in its outermost shell. Exceptions to this rule include molecules with an odd number of electrons, which means that the octet formation is numerically impossible. This odd number of valence electrons is also known as a radical, which are highly reactive, and in most cases, cannot be stored. Overall, radicals are exceptions to the octet rule since they have an odd number of electrons. In terms of electron configuration, this means that they have electrons with unpaired spins, which explains why it is highly unstable and reactive.

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