PTable Header

 Photo credit g23armstrong via flickr

“If words are not things, or maps are not the actual territory, then, obviously, the only possible link between the objective world and the linguistic world is found in structure, and structure alone.” 

-Alfred Korzybski

Periodic Trends Around the Table

Many, many physical and chemical properties 'trend' by Group and Family in the Periodic Table. We're just going to cover a few of the biggies.

Now that you know how we define each key trend (and if you skipped that page, seriously, go back and at least skim it first) you're ready to see how these trends fit within the structure of the Periodic Table itself.

Atomic Radius:

Ionization Energy:

Electron Affinity:

Electron affinity is a bit outside the scope of this class so I'm not going to get into it too deeply, other than to point out the general trend.


Chemical Reactivity:


I can't help it, I just love this video on reactivity (however embellished the reactions) down the Alkali Metals. Top Gear (BBC) fans will recognize Richard "Hamster" Hammond as the narrator here. Enjoy!

And here is a more realistic (less fun) version...


This links to the page specifically on TRENDS, but if you click around it also summarizes the other Periodic Table topics nicely.

How much do you need to know about the Periodic Table trends?