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The previous diagram for melting temperature of oxides becomes the middle panel of this five-part figure. Each panel is our same chunk of the periodic table showing the hard cations, but now with panels from bottom to top for chlorides, fluorides, oxides, nitrides, and carbides.

        That arrangement is very deliberate: as we go upward, we go from an anion of weakest anionic potential (Cl- is large with only a -1 charge) to anions of greater and greater (i.e., more negative) anionic potential, until we reach carbides with C4- at the top.

        Note what happens to the greatest melting temperatures: as we go from bottom to top, the peaking in melting temperature moves from left to right. In other words, as we go upwards to anions of more negative anionic potential, we see them combining with cations of greater and greater cationic potential to make the most stable solids in the face of high temperature. More formally, . . . . . .


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Railsback's main page about the Earth Scientist's Periodic Table of the Elements and Their Ions
e-mail to Bruce Railsback (rlsbk@gly.uga.edu)
Railsback's main web page
UGA Geology Department web page

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