Polarizing Power for Na+, Mg2+, Li+, Be2+

(Polar molecules, Non-polar molecules, etc.)

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Daniel Lai
Posts: 65
Joined: Fri Sep 28, 2018 12:28 am

Polarizing Power for Na+, Mg2+, Li+, Be2+

Postby Daniel Lai » Fri Dec 07, 2018 1:05 pm

Why is the polarizing power from least to greatest Na+, Mg2+, Li+, Be2+? I get why Na+ is the least and Be2+ is the greatest but I do not get why Li+ would be greater than Mg2+. Li+ is larger than Mg2+ according to the diagram of ionic radii in 1F.3 7th Edition and it has a lesser charge, so wouldn't it have a smaller polarizing power than Mg2+? Please help me.

Nikitha_lakshminarayanan3I
Posts: 30
Joined: Fri Sep 28, 2018 12:24 am

Re: Polarizing Power for Na+, Mg2+, Li+, Be2+

Postby Nikitha_lakshminarayanan3I » Fri Dec 07, 2018 1:15 pm

I think Mg 2+ is bigger according to the atomic radii trend

Daniel Lai
Posts: 65
Joined: Fri Sep 28, 2018 12:28 am

Re: Polarizing Power for Na+, Mg2+, Li+, Be2+

Postby Daniel Lai » Fri Dec 07, 2018 1:24 pm

Yea, but i thought we use ionic radius because these are ions?

Jonathan Pai 2I
Posts: 121
Joined: Fri Sep 28, 2018 12:27 am

Re: Polarizing Power for Na+, Mg2+, Li+, Be2+

Postby Jonathan Pai 2I » Fri Dec 07, 2018 1:28 pm

Lit is smaller so it has stronger polarizing power. You might be confusing poloarizing power with polarizability.

Daniel Lai
Posts: 65
Joined: Fri Sep 28, 2018 12:28 am

Re: Polarizing Power for Na+, Mg2+, Li+, Be2+

Postby Daniel Lai » Fri Dec 07, 2018 1:36 pm

In the books section on ionic radius Li+ is bigger than Mg2+.


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