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Atomic Radius

Posted: Tue Oct 15, 2019 10:50 pm
by Sunia Akaveka 4I
This could be such a basic question but how do you find atomic radius? To be honest, I looked at the solutions manual (specifically for 1F.1 where it asks to list the elements in order of decreasing atomic radius) and still don't understand how the measurement is obtained. Anything helps, thanks!

Re: Atomic Radius

Posted: Tue Oct 15, 2019 10:53 pm
by Tai Metzger 3K
In general, the periodic table has the following trends for atomic radius:
As you move down a column, atomic radius increases.
As you move from left to right along a row, the atomic radius decreases.

Re: Atomic Radius

Posted: Tue Oct 15, 2019 10:55 pm
by Sunia Akaveka 4I
Tai Metzger 3K wrote:In general, the periodic table has the following trends for atomic radius:
As you move down a column, atomic radius increases.
As you move from left to right along a row, the atomic radius decreases.


Wait, actually that sounds very familiar and I think I knew that subconsciously. Hahah thanks! But by any chance, do you know how to obtain the specific number?

Re: Atomic Radius

Posted: Wed Oct 16, 2019 4:09 pm
by Cynthia Gong 1L
The atomic radius is half the distance between the nuclei of two identical atoms bonded together. For the purpose of this class I don't think we would be calculating the exact value of the radius.

Re: Atomic Radius

Posted: Thu Oct 17, 2019 1:12 am
by Emma Popescu 1L
We won't need to calculate the value of atomic radius. If needed, the values should be given to us.

Re: Atomic Radius

Posted: Thu Oct 17, 2019 3:56 pm
by Ayushi2011
The value of atomic radius will always be given to us.

Re: Atomic Radius

Posted: Thu Oct 17, 2019 4:32 pm
by Julieta Serobyan4D
Atomic radius is usually given in a data booklet or just in the front page of the test.

Re: Atomic Radius

Posted: Tue Oct 22, 2019 12:48 pm
by Mariah
Cynthia Gong 1L wrote:The atomic radius is half the distance between the nuclei of two identical atoms bonded together. For the purpose of this class I don't think we would be calculating the exact value of the radius.


During the lecture, a picture was shown that said 2r from both nuclei of atoms bonded together. Do you know what that meant? It confused me because he said it's half the distance but then it said 2r.

Re: Atomic Radius

Posted: Tue Oct 22, 2019 1:10 pm
by Verity Lai 2K
I think we will always be given the atomic radius and I think the 2r was to help us understand how the atomic radii was calculated.

Re: Atomic Radius

Posted: Tue Oct 22, 2019 1:30 pm
by Robert Tran 1B
The atomic radius is usually determined experimentally by halving the distance between the nuclei of two atoms. There isn't a formula that I know of that can allow us to solve for the atomic radius of a given element/ion.

Re: Atomic Radius

Posted: Wed Oct 23, 2019 11:21 am
by PriscillaLi_3G
A visual of the atomic radius trend in the periodic table:

https://www.google.com/url?sa=i&rct=j&q ... 1235927497

Re: Atomic Radius

Posted: Wed Oct 23, 2019 11:22 am
by KBELTRAMI_1E
Tai Metzger 3K wrote:In general, the periodic table has the following trends for atomic radius:
As you move down a column, atomic radius increases.
As you move from left to right along a row, the atomic radius decreases.


Do we need to know the exact number though?

Re: Atomic Radius

Posted: Wed Oct 23, 2019 11:31 am
by Michelle Le 1J
No I don't think you need to know exactly how much the atomic radius changes, I would just know and understand the trends as you go down a group and across a period

Re: Atomic Radius

Posted: Wed Oct 23, 2019 3:11 pm
by Brittany Tran 3I
I don't think we need to calculate atomic radius directly, but it's defined as half the distance between the centers of two neighboring atoms

Re: Atomic Radius

Posted: Thu Oct 24, 2019 3:13 pm
by Anvi Brahmbhatt 4A
We probably do not need to calculate the atomic radius, but understand the periodic trend explained in the posts above!

Re: Atomic Radius

Posted: Thu Oct 24, 2019 3:19 pm
by McKenna_4A
You won't ever be asked to calculate the actual value of atomic radii. Just know the trends.

Re: Atomic Radius

Posted: Fri Oct 25, 2019 1:36 am
by Cassandra_1K
How do you differentiate between Atomic and Ionic Radius because I know they both increase when going down a group and decrease from left to right, so how are they different?

Re: Atomic Radius

Posted: Fri Oct 25, 2019 10:05 am
by Megan Jung 3A
In terms of looking at trends on the periodic table of atomic radii, the atomic radius can be defined as half the distance between to bonded atoms. This is because since electrons don't have a specific location, you cannot calculate exactly the distance between the center of the atom and the end of it.

Re: Atomic Radius

Posted: Fri Oct 25, 2019 11:05 am
by Nathan Nakaguchi 1G
The atomic radius is half the distance between the centers of neighboring atoms, I don't think we will have to ever calculate a measurement for this (it would probably be given). I believe to answer this question you go based off of the periodic trends of atomic radii, as you go down and left of the periodic table radius increases. So you compare the relative locations of the atoms of the periodic table based off of how far down and how far left they are ie the size of their radii.