Bigtime Signs 2020 Periodic Table (Black, 24")

I love this representation of the Periodic Table of the Elements. As a chemist it warms my heart. I purchased copies for some of my grandchildren, and framed one copy from my wall. The vibrant colors are beautiful and nicely group and highlight the various sections of the Table. I have one gripe, and hence only 4 stars instead of 5. The editing of the mass numbers is annoyingly inconsistent. With modern mass spectrometers, masses of individual isotopes are known with considerable precision. The Table's mass numbers themselves are weighted averages of the masses of all of the naturally occurring isotopes for each element, as determined experimentally from sampling nature. This usually means the weighted averages of the elements stable, as opposed to radioactive, isotopes. Several elements have only a single stable nuclide and therefore the mass numbers should be known with high precision, some examples would be F, Co, Mn, Au. Many other elements, such as N, Ni, Cr, and Ag have two or more stable isotopes, and therefore the listed mas numbers is the average masses of these isotopes weighted to there relative abundances. The Table values for these elements should be less precise than those of single nuclide elements. However in this table the masses of F, Co, Mn, and Au are listed to only three decimal places, while N with 2 isotopes, Ni with 5, Cr with 4, and Ag with 2 have masses listed to 4 decimal places. Why is this so? I purchased on 16"x 24" posters. If this mass inconsistency is corrected in the next addition, I may purchase one of the larger options to decorate one of my walls.

Didáctica y decorativa

Christmas present for our university student. It was absolutely perfect and will be beneficial for the chemistry classes. Sturdy, durable, and accurate. Recommend for any chemist enthusiast

Not quite as clear as I'd hoped, sort of stretched larger than the pixels wanted

Excellent! Great color! Readable.