ionic radius

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705340227
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Joined: Wed Sep 30, 2020 10:08 pm

ionic radius

Postby 705340227 » Sun Nov 01, 2020 3:39 pm

Do cations, anions, or the regular atom have the largest atomic radius?

Catie Donohue 2K
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Joined: Wed Sep 30, 2020 9:55 pm

Re: ionic radius

Postby Catie Donohue 2K » Sun Nov 01, 2020 3:43 pm

I believe that cations have fewer electrons than their parent atom and are therefore smaller. Anions are negative and therefore have more electrons, so anions are larger than the original atom.

JoshMoore2B
Posts: 90
Joined: Wed Sep 30, 2020 9:51 pm

Re: ionic radius

Postby JoshMoore2B » Sun Nov 01, 2020 3:44 pm

Anions should have the largest ionic radius, because they have extra electrons. These extra electrons increases electron-electron repulsion, fill in shells, and overall increase the range at which the anion can interact with other objects.

Generally, the radius of atoms or ions is determined by their electrons, so adding more should naturally increase the radius.

Gian Boco 2G
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Joined: Wed Sep 30, 2020 9:36 pm

Re: ionic radius

Postby Gian Boco 2G » Sun Nov 01, 2020 4:59 pm

Cations would be smaller than their normal atoms because there are more protons than there are electrons, reducing electron repulsion as well allowing the protons to pull tighter on the lesser number of electrons, making that ionic radius smaller.

Lauren Mungo 1K
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Re: ionic radius

Postby Lauren Mungo 1K » Sun Nov 01, 2020 5:19 pm

Cation are smaller than the original atom because there is less electron-electron repulsion. Anions are larger than their original atom for the opposite reason, there is more repulsion.

Ansh Patel 2I
Posts: 93
Joined: Wed Sep 30, 2020 9:42 pm

Re: ionic radius

Postby Ansh Patel 2I » Sun Nov 01, 2020 5:22 pm

Hi! Cations have the smallest ionic radius, and anions have the largest. This is because cations have more protons than electrons (therefore positively charged), which lowers the electron-electron repulsion.

Justin Lin 1B
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Joined: Wed Sep 30, 2020 9:50 pm

Re: ionic radius

Postby Justin Lin 1B » Sun Nov 01, 2020 5:26 pm

Cations would be smaller than the original atom because of less electron repulsion while anions are larger because of more electron repulsion

Nhu Pham-Dis3G
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Joined: Wed Feb 26, 2020 12:15 am

Re: ionic radius

Postby Nhu Pham-Dis3G » Sun Nov 01, 2020 5:40 pm

Anions have a larger atomic radius compared to the regular atom, and cations have a smaller atomic radius compared to the regular atom. This is because more electrons = increased electron-electron repulsion. On the other hand, with cations, the valence electrons (furthest away from nucleus) are lost.
Last edited by Nhu Pham-Dis3G on Sun Nov 01, 2020 6:13 pm, edited 1 time in total.

AntonioZarich2E
Posts: 41
Joined: Wed Sep 30, 2020 9:43 pm

Re: ionic radius

Postby AntonioZarich2E » Sun Nov 01, 2020 5:45 pm

Is there an easy way to find out if an anion of an element would be bigger than a cation of a different element, if the natural atom of the element corresponding to the anion is smaller than that of the cation?

joshtully
Posts: 92
Joined: Wed Sep 30, 2020 9:36 pm

Re: ionic radius

Postby joshtully » Sun Nov 01, 2020 6:18 pm

Anions have the largest ionic radius, while cations have the smallest ionic radius.

LovepreetSran_3H
Posts: 76
Joined: Wed Sep 30, 2020 9:33 pm

Re: ionic radius

Postby LovepreetSran_3H » Sun Nov 01, 2020 6:42 pm

Anions have the largest ionic radius since they have more electrons then the original atom, while cations have the smallest ionic radius since they have less electrons than the original atom.

Joshua Chung 2D
Posts: 96
Joined: Wed Sep 30, 2020 9:32 pm

Re: ionic radius

Postby Joshua Chung 2D » Sun Nov 01, 2020 7:00 pm

As anions have extra electrons and cations have less electrons than the "normal" state of the element, anions are larger and cations are smaller.

Sabrina Galvan 3J
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Re: ionic radius

Postby Sabrina Galvan 3J » Sun Nov 01, 2020 7:04 pm

In order of smallest to largest ionic radius, it goes cation, normal, and anion.

Muskaan Abdul-Sattar
Posts: 90
Joined: Wed Nov 13, 2019 12:19 am

Re: ionic radius

Postby Muskaan Abdul-Sattar » Mon Nov 02, 2020 12:01 am

Hey! I believe that cations have the smallest ionic radius, while anions have the largest.

Manseej Khatri 2B
Posts: 76
Joined: Wed Sep 30, 2020 9:42 pm

Re: ionic radius

Postby Manseej Khatri 2B » Mon Nov 02, 2020 12:09 am

Hi. Cations have less electrons, meaning the pull of the nucleus' positive charge is stronger and the radius is smaller relative to the original atom. The anion has more electrons, meaning the radius would be larger relative to the parent atom as there are more electrons and the effective nuclear charge would thus decrease.


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