This version of the right side of the table (and of almost any periodic table) shows the first dissociation constant of XHn substances. At the right, we're used to thinking of HCl (hydrochloric acid) as an acid and quickly extend that thought to HBr (hydrobromic acid) and HI (hydroiodic acid). Thinking of methane (CH4) as an acid is more of a stretch. However, if one does so, one sees that contouring data on a periodic table is a useful concept. Chemists will talk about variation in dissociation constant across rows and then talk about it down columns, but it's clearly a gradient in two dimensions.

        Going to the left side of the table, . . . .


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The last slide of this presentation
Railsback's main page about the Earth Scientist's Periodic Table of the Elements and Their Ions
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Railsback's main web page
UGA Geology Department web page

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