NCK Periodic Table of Elements Poster Big Size (27 x 39 Inches) Rollable Modern Most extensive detailed Info 2020 Version.Chart for Kids, Students, Teachers, Chemistry Professionals

Mostly looks fine on the wall, but has some errors that don't jump out at first.Barium first ionization energy is printed in the wrong place.Dysprosium has blue text for no reason.Still shows density of Iridium higher than Osmium, despite the literature getting that sorted out decades ago. Element melting points have crazy significant figures. Some elements 2 decimal points, others none at all. makes quick comparisons hard, since sometimes it takes a second to realize that Iodine is reported as 113.5, which is not a 4 digit number. Should keep the same number of decimal points on everythingshows Ga, Rb, and Cs as being liquid at room temperature, even though melting points over 30 C. Most tables just have Hg and Br as liquid at room temp, and there's nothing wrong with that.Doesn't show Tc as a synthetic element.shows common crystal structure, including tetragonal, in the legend, but no element is shown as having that crystal structure. Not sure if it's just included in the legend for no reason, or if it is a table error.doesn't show discovery dates for any old element, except gold. Au gets a est. 3000 BC, but all other ancient elements (iron, tin, lead, etc.) just get blank.lists all possible oxidation states. Which is nearly "all of them" for transition metals, and makes very crowded, but doesn't really add useful information.

Atomic Weight for Silver (Ag) is 107.8682 amu. This chart shows 101.868. I do not know if there are other inaccuracies, nor will I proof it for the seller/manufacturer. I am going to ask for my money back. Also, it is quite glossy, making it difficult to read with certain angles (light reflection).