Ion Trends

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Emma Healy 2J
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Joined: Wed Sep 30, 2020 9:45 pm

Ion Trends

Postby Emma Healy 2J » Sun Nov 15, 2020 9:45 pm

What are some of the ion trends that we should know? And could someone please explain the ionic radius trend?

Lucy Wang 2J
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Re: Ion Trends

Postby Lucy Wang 2J » Sun Nov 15, 2020 9:46 pm

I think you should know trends for ionization energy, electronegativity, atomic radius.

i'm not really sure about any others

Savana Maxfield 3F
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Re: Ion Trends

Postby Savana Maxfield 3F » Sun Nov 15, 2020 9:48 pm

As you move down a group, ionic radius increases. As you move across a period, ionic radius decreases.

Jessica Manriquez 1H
Posts: 50
Joined: Wed Sep 30, 2020 9:47 pm

Re: Ion Trends

Postby Jessica Manriquez 1H » Sun Nov 15, 2020 9:52 pm

https://sciencenotes.org/periodicity-de ... chemistry/
the main picture in this website really helped me memorize the trends; Hope this helped :)

LarisaAssadourian2K
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Joined: Wed Sep 30, 2020 9:34 pm

Re: Ion Trends

Postby LarisaAssadourian2K » Sun Nov 15, 2020 9:56 pm

The previous posts are correct, but you should also know about electron affinity, which increases as you go up the periodic table and to the right.

Gabe_Ek 1G
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Joined: Wed Sep 30, 2020 10:04 pm

Re: Ion Trends

Postby Gabe_Ek 1G » Sun Nov 15, 2020 9:58 pm

I think the atomic radius trend Is a trend we should know but I am not sure about the Ionic trend. But for the ionic radius, it decreases across a period and down a group the ionic radius increases.

George_Yin_3I
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Re: Ion Trends

Postby George_Yin_3I » Sun Nov 22, 2020 9:43 pm

First you have to remember the ionic radius, which is similar to atomic radius principle.

George_Yin_3I
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Joined: Wed Sep 30, 2020 9:42 pm

Re: Ion Trends

Postby George_Yin_3I » Sun Nov 22, 2020 9:44 pm

The special case in ionic radius is regarding radius comparison among isoelectronic ions, in which cations are smaller than anions due to the larger proton number and greater effective nuclear charge.

George_Yin_3I
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Re: Ion Trends

Postby George_Yin_3I » Sun Nov 22, 2020 9:45 pm

Besides ionic radius, I believe electron affinity, (first) ionization energy, and electronegativity are some other important properties.

Taha 2D
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Joined: Wed Sep 30, 2020 9:50 pm

Re: Ion Trends

Postby Taha 2D » Sun Nov 22, 2020 9:46 pm

cations are smaller than their atoms(they lose their valence shell)
anions are larger than their atoms
size increases down the group and decreases across

Neel Sharma 3F
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Re: Ion Trends

Postby Neel Sharma 3F » Sun Nov 22, 2020 9:49 pm

Atomic radius: Increase down a group, decrease across a period.
Ionic radius: Increase down a group, decrease across a period (diagonal relationships) with cations decreasing in size as they become ions and anions increasing in size.
Hope this helps!

nayha a 1E
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Joined: Wed Sep 30, 2020 9:54 pm

Re: Ion Trends

Postby nayha a 1E » Sun Nov 22, 2020 9:49 pm

Ionic radius and atomic radius follow the same general trend of increasing down a group and decreasing across a period. On the other hand, electronegativity increases across a period and decreases down a group. A general trend is that high electronegativity=high electron affinity.

Melanie Krahn 1C
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Joined: Wed Sep 30, 2020 9:34 pm

Re: Ion Trends

Postby Melanie Krahn 1C » Sun Nov 22, 2020 9:50 pm

Are there any notable exceptions to the "trends" that we should be able to memorize and know off-hand without relying on looking at the periodic table?

Lauren Mungo 1K
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Re: Ion Trends

Postby Lauren Mungo 1K » Sun Nov 22, 2020 9:51 pm

Radius increases down a group and decreases across a period. Ionization energy and electron affinity increases across a period and decreases down a group. Anions have a greater radius and cations have a smaller radius.

rita_debbaneh2G
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Joined: Wed Sep 30, 2020 9:57 pm

Re: Ion Trends

Postby rita_debbaneh2G » Sun Nov 22, 2020 9:54 pm

The ion related trends are as follows. When you move from top to bottom of the periodic table, the ionic radius decreases, the ionization energy decreases, and electronegativity decreases. Moving from left to right shows that ionic radius increases, ionization energy increases, and electronegativity increases.

Micaela Estavillo
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Joined: Wed Sep 30, 2020 9:44 pm

Re: Ion Trends

Postby Micaela Estavillo » Sun Nov 22, 2020 9:58 pm

Atomic radius:
Decrease across
Increase down
Electron Affinity, Ionization Energy, and Electronegativity:
Increase across
Decrease down

Melissa Solis 1H
Posts: 97
Joined: Wed Sep 30, 2020 10:08 pm

Re: Ion Trends

Postby Melissa Solis 1H » Sun Nov 22, 2020 10:01 pm

I agree with everyone else!

Focus on:
Atomic radius, which increases down while it decreases across
Electron Affinity, Ionization Energy, and Electronegativity, which increase across in a diagonal direction and decrease diagonally.

Muskaan Abdul-Sattar
Posts: 79
Joined: Wed Nov 13, 2019 12:19 am

Re: Ion Trends

Postby Muskaan Abdul-Sattar » Sun Nov 29, 2020 10:16 pm

Atomic radius, electronegativity, and ionization energy are probably important ones to know! There are periodic tables that you can look up online with trends outlined on them.

Jaclyn Schwartz 1I
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Joined: Wed Sep 30, 2020 9:45 pm

Re: Ion Trends

Postby Jaclyn Schwartz 1I » Sun Nov 29, 2020 11:13 pm

I agree with everyone! I would probably say electronegativity would be the most important but Atomic radius, electron affinity, and ionization energy are important as well. But instead of trying to just memorize trends, try to think of why that trend occurs.

For atomic radius it increases as you go down the periodic table because more valence shells increases the size and it decreases as you go across from left to right because of the electron attraction to the nucleus grows stronger, pulling in the electrons closer to the nucleus.

For the ionization energy it increases left to right because more energy is needed to remove the electrons from their valence shells. Like in group 1 and 2, they have low ionization energy because they give their electrons, often becoming cation. And in group 7, they have high ionization energy because they only need one more electron to form an octet. Electronegativity and electron affinity follow this trend as well.

I hope this helps you memorize it little better!


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