Periodic table trend

[Hemichordate]

What are the periodic table trends for acidity, basicity, and nucleophilicity?

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[mcatbeast]

acidity increases going left to right (because more electronegative atoms can stabilize the negative charge on the anion) and increases going down because the larger the atom the better it can delocalize the negative charge.

Nucleophicity and basicitiy tend to be similar to each other but opposite to electrongegativity trends. Nucleophicity increases going left across a period and up a group.

hope that helps

 

[EgyptianDoc]

BEANS. Look at a periodic table and write a "B" on the top left, "E" on the top right, "A" on the bottom right, and an "N" and "S" on the bottom left. All those increase in a direction towards that letter.

B=Basicity
E=Electronegativity, ionization Energy, and Electron affinity
A=Acidity
N=Nucleophilicity
S=Shielding

In regards to the post above, the nucleophilicity trend is the same as the basicity trend going across a row only. Within the same group, the trend is the opposite. In other words, both "N" and "B" increase from right to left, but "B" increases bottom to top and "N" increases top to bottom. Just remember BEANS. You can also think of it as BEARS. R=atomic Radius. Just replace the "N" with the "R." Hope this helps

 

[Rabolisk]

To further increase the nuances of nucleophilicity, it is often reversed when in aprotic solvents, but this is a minor point. That is, nucleophilicty and basicity have the same trends in aprotic solvents (increases up a group), rather than different (nucleophilicity being down a group). Remember that nucleophilicity is a kinetic concept, and that basicity is a thermodynamic concept.

 

[Hemichordate]

BEANS. Look at a periodic table and write a "B" on the top left, "E" on the top right, "A" on the bottom right, and an "N" and "S" on the bottom left. All those increase in a direction towards that letter.

B=Basicity
E=Electronegativity, ionization Energy, and Electron affinity
A=Acidity
N=Nucleophilicity
S=Shielding

In regards to the post above, the nucleophilicity trend is the same as the basicity trend going across a row only. Within the same group, the trend is the opposite. In other words, both "N" and "B" increase from right to left, but "B" increases bottom to top and "N" increases top to bottom. Just remember BEANS. You can also think of it as BEARS. R=atomic Radius. Just replace the "N" with the "R." Hope this helps

Awesome. Definitely a good one to use.
Also, we can put the leaving group (LG) ability in the acidity corner, right?
Increasing acidity = same trend as better leaving group

 

[ElliottB]

BEANS. Look at a periodic table and write a "B" on the top left, "E" on the top right, "A" on the bottom right, and an "N" and "S" on the bottom left. All those increase in a direction towards that letter.

B=Basicity
E=Electronegativity, ionization Energy, and Electron affinity
A=Acidity
N=Nucleophilicity
S=Shielding

In regards to the post above, the nucleophilicity trend is the same as the basicity trend going across a row only. Within the same group, the trend is the opposite. In other words, both "N" and "B" increase from right to left, but "B" increases bottom to top and "N" increases top to bottom. Just remember BEANS. You can also think of it as BEARS. R=atomic Radius. Just replace the "N" with the "R." Hope this helps

Wow, this is really helpful. Thanks!

 

[EgyptianDoc]

Awesome. Definitely a good one to use.
Also, we can put the leaving group (LG) ability in the acidity corner, right?
Increasing acidity = same trend as better leaving group

Yes.

Wow, this is really helpful. Thanks!

No problem.

 

[tartrate]

Cool beans.

 

[Don Draper]

wow, I never had any of these.

I think it may be easier just to know how the sizes and electronegativies work, then derive everything from those.