How to Treat Anions and Cations

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Izamary Marquez 2H
Posts: 92
Joined: Wed Sep 30, 2020 9:44 pm

How to Treat Anions and Cations

Postby Izamary Marquez 2H » Fri Nov 13, 2020 10:00 pm

With regards to cations and anions, is there a certain periodic table pattern as to where they happen to appear more frequently? What does this telling about their bonding properties and does this have anything to due with their electronegativity?

Tam Nguyen 2B
Posts: 69
Joined: Wed Sep 30, 2020 9:43 pm

Re: How to Treat Anions and Cations

Postby Tam Nguyen 2B » Fri Nov 13, 2020 10:04 pm

Cations usually occupy the left side of the periodic table, all of the alkalis, because they easily lose their electrons. The anions are closer to the right side where all of the nonmetals are. The electronegativity is affected by this because it increases as elements move to the right where the nonmetals are. They're trying to complete their octet so it makes sense they get stronger on that side.

Sami Siddiqui 1J
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Re: How to Treat Anions and Cations

Postby Sami Siddiqui 1J » Fri Nov 13, 2020 10:08 pm

Cations are much more common as you move closer to the left of the periodic table, otherwise known as the s-block. This is because the ionization energy for removing electrons decreases as you move to the left of a given period (and also as you go down a group). Because of this concept, metals in the s-block are more likely to release their electrons to obtain their octet formation and attain a noble gas configuration; in short, these metals become cations. Regarding anions, as you move to the top right corner of the periodic table, the electronegativity (the amount of electron pull an atom would have in a molecule) increases. Because the p-block elements are among the highest in electronegativity, they are more likely to strip electrons from other atoms and obtain an octet configuration in this way. In short, elements that perform this become anions.

AdilaAhmed3I
Posts: 96
Joined: Wed Sep 30, 2020 10:01 pm

Re: How to Treat Anions and Cations

Postby AdilaAhmed3I » Fri Nov 13, 2020 10:14 pm

So cation are ions that lose electrons and have a positive charge. These would usually show up in group 1-13 and would have formulas like Ca+2. For these atoms, the quickest way to become stable (or like the noble gases) is to give up electrons and have an overall positive charge.
For anions, these are ions that gain electrons and have a negative charge due to the extra electrons. These would show up in groups 14-18. The quickest way for these atoms to be stable is to gain electrons to be like the noble gases.

AustinMcBrideDis3L
Posts: 86
Joined: Wed Sep 30, 2020 9:39 pm

Re: How to Treat Anions and Cations

Postby AustinMcBrideDis3L » Fri Nov 13, 2020 10:20 pm

Cations are typically found on the left side of the periodic table (Alkali metals/Alkaline earth metals -groups 1&2)
Anions are found on the right side (Halogens/Chalcogens - groups 16&17)
Note that towards the middle of these two groups the lines get more blurry and you start seeing elements such as metalloids.
Also the noble gases (on the farthest right) are not anions as they have the full octet in their natural state.


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