Ion Trends
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Ion Trends
What are some of the ion trends that we should know? And could someone please explain the ionic radius trend?
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Re: Ion Trends
I think you should know trends for ionization energy, electronegativity, atomic radius.
i'm not really sure about any others
i'm not really sure about any others
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Re: Ion Trends
As you move down a group, ionic radius increases. As you move across a period, ionic radius decreases.
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Re: Ion Trends
https://sciencenotes.org/periodicity-de ... chemistry/
the main picture in this website really helped me memorize the trends; Hope this helped :)
the main picture in this website really helped me memorize the trends; Hope this helped :)
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Re: Ion Trends
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.
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Re: Ion Trends
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.
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Re: Ion Trends
First you have to remember the ionic radius, which is similar to atomic radius principle.
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Re: Ion Trends
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.
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Re: Ion Trends
Besides ionic radius, I believe electron affinity, (first) ionization energy, and electronegativity are some other important properties.
Re: Ion Trends
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
anions are larger than their atoms
size increases down the group and decreases across
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Re: Ion Trends
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!
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!
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Re: Ion Trends
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.
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Re: Ion Trends
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?
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Re: Ion Trends
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.
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Re: Ion Trends
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.
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Re: Ion Trends
Atomic radius:
Decrease across
Increase down
Electron Affinity, Ionization Energy, and Electronegativity:
Increase across
Decrease down
Decrease across
Increase down
Electron Affinity, Ionization Energy, and Electronegativity:
Increase across
Decrease down
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Re: Ion Trends
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.
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.
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Re: Ion Trends
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.
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Re: Ion Trends
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!
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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