Ion Size

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A Raab 1K
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Joined: Sat Aug 24, 2019 12:16 am

Ion Size

Postby A Raab 1K » Thu Dec 05, 2019 7:07 pm

Is Mg+2 bigger or smaller than Na+?
Is O-2 bigger or smaller than N-3?
Arrange the anions Cl- , Br- , N-3, and O-2 in order of increasing polarizability and give reasons for your decisions.
Thanks!

Lindsey Chheng 1E
Posts: 110
Joined: Fri Aug 30, 2019 12:16 am

Re: Ion Size

Postby Lindsey Chheng 1E » Thu Dec 05, 2019 7:16 pm

A Raab 1K wrote:Is Mg+2 bigger or smaller than Na+?
Is O-2 bigger or smaller than N-3?
Arrange the anions Cl- , Br- , N-3, and O-2 in order of increasing polarizability and give reasons for your decisions.
Thanks!

Mg2+ is smaller than Na+ because two cations have the same amount of electrons but Mg has one more proton than Na so it pulls it's electrons closer due to a higher effective nuclear charge.

The more electrons something has or the bigger the ion is, the more polarizable it is, so the order is Br-, Cl-, N3-, O2-

Tai Metzger 3K
Posts: 103
Joined: Sat Aug 24, 2019 12:17 am

Re: Ion Size

Postby Tai Metzger 3K » Thu Dec 05, 2019 7:23 pm

Mg 2+ is smaller than Na+ because they have the same number of e- but Mg has more protons, pulling the e- closer to the nucleus.
O2- is smaller than N3- for the same reason.
N3- is more polarizable than O2- because it is smaller.
Br- is more polarizable than Cl- because it is larger, making it easier for a cation to distort its e-.


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