Now you know I asked if the elements had been moving around, not being added. Were your periodic tables in a different order or are you just trying to avoid the point?
"The electromagnetic spectrum is not the same class of concept as a periodic chart, our understanding of the spectrum has certainly been refined in the last 150 years, as have the "laws" of chemistry and gravity. There are quite a few phenomena, such as superconductivity, that were not anticipated and which are not yet fully understood."<./i>
Oh? Have radio waves changed position on the spectrum? Or Infrared? Ultraviolet?
"Are you unaware of this, or are you leading up to an actual argument?"
Why did you cut it out and then pretend it wasn't there? Think no one will notice?
"Or are you incorrectly equating science with metaphysics?"
You're not being honest.
The periodic chart has a history and is still subject to revisions. The sequence of elements is determined by atomic number, and several elements have been added since I was in high school.
But your basic point, as I understand it, is that there are some phenomena that are so well understood and so well documented, that we take then to be be facts.
Common descent is a fact accepted even by critics of evolution. It is subject to no more doubt than the fact that the earth revolves around the sun.