Here's the left side of the table, with those contours now in blue or brown. Note that the second blue contour for z/r = 2 goes through the middle of the rectangle for Ca2+. It has to, as dictated by the math we did a couple of slides back. The same logic dictates the position of all the contours.|
The part of the table as which we're looking shows cations from which all outer shell electrons have been removed. For example, Na+, Mg2+, Al3+, Si4+, P5+, and S6+ all have the same out-shell electron configuration, the same as that of neon. These ions are thus called "hard" cations, in that they more-or-less meet the expection of a hard sphere because their outer electron shell is full.
We can continue these contours to the right . . .
The first slide of this presentation
The last slide of this presentation
Railsback's main page about the Earth Scientist's Periodic Table of the Elements and Their Ions
e-mail to Bruce Railsback (email@example.com)
Railsback's main web page
UGA Geology Department web page