Atomic radii

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Melody Haratian 2J
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Joined: Wed Sep 30, 2020 9:48 pm
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Atomic radii

Postby Melody Haratian 2J » Sat Oct 31, 2020 8:25 pm

Hi everyone!
The atomic radii increases down a group and decreases across a period. I was wondering, which one has a greater effect on the atomic radii? Does going down a group increase the atomic radii more than going across a period would decrease the atomic radii?
Thanks!

Jayasree Peri 2J
Posts: 97
Joined: Wed Sep 30, 2020 10:03 pm

Re: Atomic radii

Postby Jayasree Peri 2J » Sat Oct 31, 2020 8:29 pm

Going down a group would increase the atomic radii more because you're adding a whole new energy level (a new shell). Going across a period decreases the atomic radii because of the attractions between the electrons in the valence shell and the protons in the nucleus; although it does decrease the atomic radii, it doesn't get rid of a whole shell in the way that going down a group adds a whole shell. Hope this helps!

Jaden Joodi 3J
Posts: 88
Joined: Wed Sep 30, 2020 9:31 pm

Re: Atomic radii

Postby Jaden Joodi 3J » Sat Oct 31, 2020 8:56 pm

^^^^^
The reason why the effect going across a row has such a lower effect on the decrease of the atomic radii is because of the electron shielding's limited effect. Increasing radii through gaining new shells is much greater of an effect.


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