This chart brings up the question of HOW exactly each element is created...
A long time ago, in Alchemy, there was the idea that certain elements could be transformed into other elements by alchemical processes. This idea, back then, was called "Transmutation".
Now, scientists of today know transmutation as possible, but only with select heavy elements, and only in atom smashers/cyclotrons/large hadron colliders -- call them by whatever name you will.
Also, there exist radioactive elements which, over (usually!) very long periods of time, decay or transmute, into lighter elements.
The common theme, in all of the above, is radiation.
In other words, radiation is somehow linked to the transformation of elements.
Now, with that in mind, if I may posit an impromptu hypothesis, and that is, not all radiation is created equal...
In other words, you have alpha rays, beta rays, x-rays, gamma rays, etc. Or call them particles instead of rays if you prefer.
Anyway, Each of these particles/rays has different penetrating power. An alpha ray/particle (if I recall correctly) is blocked by a piece of paper, but it takes yards and yards of cement or metal to block a gamma ray -- and that's even if you can do it.
But, here's the thing.
Usually we see heat in the role of transforming things, not so much from element to element, but from compound to elements (i.e., refining iron from iron ore).
So, with that in mind, here's the hypothesis:
Perhaps heat -- is actually radiation, but at a lower scale/magnitude/area of effect/penetration-of-space/ability to traverse a distance, power.
In other words -- heat is localized radiation.
Or, phrased another way, radiation is heat -- but sent outward to a non-local distance.
So why is radiation "cold" at a distance to us humans?
Well, remember that that's a scale effect (the underlying energy should have the same pattern regardless of scale, that is, scale could be much smaller), and the Inverse Square Law (https://en.wikipedia.org/wiki/Inverse-square_law) still applies.
So, heat as localized radiation, and radiation as larger-in-scale-with-respect-to-distance heat.
A crackpot theory?
Perhaps!
You be the judge!