#Periodic table chemistry nyc free

Notes on variant backgrounds: -(a) Ac … : some early actinoids Pa to Pu (and possibly Th and Am) are chemically quite different from their lanthanoid counterparts (Ce)-Pr-Nd-Pm-Sm-(Eu). Colored block castes of elements: s-yellow, p-green, d-blue, f-lilac. −4th line: g = group number = number of chemically active electrons in the valence shell of largely neutral atoms bonded at ambient conditions (modulo 10). simple = simplified approximate chemical valence configuration of typical bonded atoms. realistic = ℓ-occupations of typical, bonded atoms in real chemical compounds, where the case-dependent population parameter is mostly 0 < δ < 1.

#Periodic table chemistry nyc free

−1st line at the top: Madelung's 'idealized' occupations of the s, p, d, f (ℓ = 0, 1, 2, 3) valence shells in many neutral unbound free atoms in physical vacuum, taken over by the chemical community as the (n+ℓ, n) rule for less or more polar-bonded atoms in chemical compounds. | The elegant 'Left Step' periodic table, following the canonized '(n+ℓ, n) rule,' see relation (5) below. The combination of experimental data and theoretical insight supports a more nuanced understanding of complex periodic trends and non-periodic phenomena. While it is essential that Periodic Tables display important trends in element chemistry we need to keep our eyes open for unexpected chemical behavior in ambient, near ambient, or unusual conditions. Simplified, artistic, or economic tables are relevant to educational and cultural fields, while practicing chemists profit more from “chemical tables of chemical elements.” Such tables should incorporate four aspects: (i) typical valence electron configurations of bonded atoms in chemical compounds (instead of the common but chemically atypical ground states of free atoms in physical vacuum) (ii) at least three basic chemical properties (valence number, size, and energy of the valence shells), their joint variation across the elements showing principal and secondary periodicity (iii) elements in which the (sp)8, (d)10, and (f)14 valence shells become closed and inert under ambient chemical conditions, thereby determining the “fix-points” of chemical periodicity (iv) peculiar elements at the top and at the bottom of the Periodic Table.

Such tables have been designed with the aim of either classifying real chemical substances or emphasizing formal and aesthetic concepts. To this end, a graphical display of the chemical properties of the elements, in the form of a Periodic Table, is the helpful tool. Comprehensive overviews of the chemistry of the elements and their compounds are needed in chemical science.

I would much rather be pumping out episodes at a rapid clip! I’ll be back at it as soon as I can, and as always, thank you for listening.The chemical elements are the “conserved principles” or “kernels” of chemistry that are retained when substances are altered. The good news is - knock on wood - all this should be well behind me a few months from now.Īctually, the real good news is that walking the halls of medicine allows for new opportunities to collect chemical elements! A friendly MRI tech let me keep my bottle of contrast agent, pictured above, which allowed me to add gadolinium to my personal collection! (Granted, the bottle is empty, but there’s still a little bit of gadolinium slime stuck to the walls of this vessel.)Īnyway, I’m sorry for the loss in momentum. I’m not sure what kind of schedule I’ll be able to stick to for the next couple weeks or possibly months. It’s nothing terribly worrisome, but it is taking up a lot of time and energy. I’m not out of the woods yet, but whatever comes next health-wise, I’m nonetheless making steady progress on the next episode’s script, Thorium.īoy howdy, it sure has been a long time since we’ve had a new episode, hasn’t it? Unfortunately, I’m afraid it may still be a while yet before we get to hear the stories behind thorium.Ī new and rather unexpected health issue has cropped up for me recently, and it’s going to be an issue for the foreseeable future. I can’t tell you how much it means to hear all your well-wishes, and it gladdens me to know that my little passion project has attracted the ears of such thoughtful people.

It would feel a little self-indulgent to respond individually to everyone’s comments here, but I just wanted to mention how blown away I am by everyone’s kind comments. I’ve written this as a comment below, but it feels important enough to add to the top of the post, too: