periodic table

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Nan_Guan_1L
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Joined: Wed Sep 30, 2020 9:59 pm

periodic table

Postby Nan_Guan_1L » Sat Oct 17, 2020 7:13 am

can someone summarize the major trends that can be found in the periodic table? Thank you!

Jade_Tai_2L
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Joined: Wed Sep 30, 2020 9:33 pm

Re: periodic table

Postby Jade_Tai_2L » Sat Oct 17, 2020 9:26 am

electronegativity: increases from left to right across a period of elements. decreases from top to bottom down a group.

ionization energy: increases from left to right.

electron affinity: increases from left to right. generally decreases down a group of elements

atomic radius: increases down a group. decreases from left to right.

There might be more that I'm missing, but these are the ones I remember! Hope this helps (please correct me if I'm wrong in any of the trends!)

Amanda Bueno-Kling
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Re: periodic table

Postby Amanda Bueno-Kling » Sun Oct 18, 2020 9:43 pm

I find a visual to be very helpful for me when studying trends. Images like this one help me to visualize the concept and remember it. In high school chemistry, I found it useful to draw out the trends a few times to really get them down.
https://www.google.com/url?sa=i&url=htt ... AdAAAAABAD

Jasmine Yi 1G
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Joined: Wed Sep 30, 2020 9:37 pm

Re: periodic table

Postby Jasmine Yi 1G » Thu Nov 05, 2020 11:19 pm

It can also help when you always think of trends in terms of which directions they increase in. At least, that's how I memorized them. Hope that helps!

Shrinidhy Srinivas 3L
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Re: periodic table

Postby Shrinidhy Srinivas 3L » Fri Nov 06, 2020 9:28 am

The way that I remember this is that atomic radius is the only one that decreases across a period and increases down a group. The rest of the trends (electronegativity, electron affinity, etc.) all increase across a period and decrease down a group. Hope this helps!

t_rasul2I
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Re: periodic table

Postby t_rasul2I » Sun Nov 08, 2020 12:49 am

atomic radii increase down a group and decrease across a period. cations are typically smaller and anions are larger. Ionization energy decreases down a group and increases accross a period. Electron affinity increases across a period.

605291562
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Joined: Wed Sep 30, 2020 10:07 pm

Re: periodic table

Postby 605291562 » Sun Nov 08, 2020 4:16 pm

Hi! I always use the atomic radius to remember the rest so then I only have to memorize one. Atomic radius decreases across a period and increases down the group. If you then think of how increasing or decreasing the radius it effects the other principals (I think they are almost always inversely related). Hope that makes sense!

Danielle DIS2L
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Re: periodic table

Postby Danielle DIS2L » Sun Nov 08, 2020 4:24 pm

Atomic radius increases down a group and decreases from left to right
Electronegativity: increases across the periodic table and decreases from top to bottom.
Electron affinity: increases across the periodic table and decreases from top to bottom
Ionization Energy: increases across the periodic table

keely_bales_1f
Posts: 89
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Re: periodic table

Postby keely_bales_1f » Sun Nov 08, 2020 4:57 pm

I found this image that has a summarization of periodic table trends. I have attached the image below. Hope you find it helpful!
Attachments
IMG_5770.JPG

Arnav Saud 2C
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Re: periodic table

Postby Arnav Saud 2C » Sun Nov 08, 2020 5:10 pm

For me, learning the trends was easiest with visual aids like this one.
https://upload.wikimedia.org/wikipedia/ ... trends.svg

Violet Kwan 3H
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Re: periodic table

Postby Violet Kwan 3H » Sun Nov 08, 2020 5:17 pm

Memorizing the trends that all the comments said above will be helpful to answer questions easily, but make sure you also conceptually understand why these trends are happening (such as the number of protons or shells) . When I understand why these trends work, it helps me to remember them more. :)

Sreeram Kurada 3H
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Re: periodic table

Postby Sreeram Kurada 3H » Sun Nov 08, 2020 5:21 pm

An easy way to remember this is to picture ionization energy, electron affinity, and electronegativity as the same thing, and how going across a period from left to right leads to an increase, while when you go from bottom to up a group leads to an increase in IE, EA, and E and vice versa.

Nick P 3D
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Joined: Wed Sep 30, 2020 9:42 pm

Re: periodic table

Postby Nick P 3D » Sun Nov 08, 2020 5:38 pm

The easiest way I have found to keep track of all the trends is that they all increase across periods and down groups except for atomic radius. Atomic radius is the only one to decrease across a period and increase down groups (an arrow pointing down and left.) Electronegativity, electron affinity, and all the others are all an arrow pointing up and right.

Marco Vivar 3G
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Re: periodic table

Postby Marco Vivar 3G » Sun Nov 08, 2020 11:52 pm

I would use a visual aid to mark your period table and practice by trying to compare different elements.

Tiao Tan 3C
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Joined: Wed Sep 30, 2020 9:59 pm

Re: periodic table

Postby Tiao Tan 3C » Wed Nov 11, 2020 8:22 am

Basically electronegativity, electron affinity, and ionization energy all follow the same trend: increasing across a period and increasing up a group. I like to memorize the increasing trends with an arrow pointing to the upper right corner of the periodic table if that makes sense.
Atomic radius is the only one that differs and is opposite of the other trends: decreasing across a period and decreasing up a group.

Taber Ball 1F
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Re: periodic table

Postby Taber Ball 1F » Wed Nov 11, 2020 12:16 pm

Arnav Saud 3K wrote:For me, learning the trends was easiest with visual aids like this one.
https://upload.wikimedia.org/wikipedia/ ... trends.svg


This is so helpful! Thank you! (:

Ariel Guan 1H
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Re: periodic table

Postby Ariel Guan 1H » Wed Nov 11, 2020 7:55 pm

keely_bales_2a wrote:I found this image that has a summarization of periodic table trends. I have attached the image below. Hope you find it helpful!


this actually helps a lot- tysm!


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