Across vs Down Trend

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Myles Chang 1B
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Joined: Fri Apr 06, 2018 11:02 am

Across vs Down Trend

Postby Myles Chang 1B » Mon May 07, 2018 12:43 am

Hello! I had a question regarding whether an element's period or column had a larger influence on its atomic radius. For example, which would have a larger atomic radius: zinc or silver?

Posts: 68
Joined: Thu Jul 27, 2017 3:00 am

Re: Across vs Down Trend

Postby 404975170 » Mon May 07, 2018 1:27 am

As you move across the period the atomic radius gets smaller and as you move down the column the radius gets bigger. So silver has a larger atomic radius than zinc. This is because when you add a proton, then the nucleus pulls the electrons in stronger, pulling the atoms cell close to the nucleus. So then the atomic radius decreases, and when you take away a proton then the atomic radius increases.

Hannah Lee 1B
Posts: 26
Joined: Fri Apr 06, 2018 11:03 am

Re: Across vs Down Trend

Postby Hannah Lee 1B » Mon May 07, 2018 2:52 am

Across a period the radius gets smaller while down a group it gets bigger. Since silver is lower and to the left, it is bigger than zinc in both aspects. Comparing elements like nitrogen and sulfur would be more ambiguous, however it's not likely that questions like that would be asked.

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