Tribute to Niobium Discoverer 1.5 inch 38.1mm diameter Pure Nb Metal Coin

Description

Material: Niobium metal;
Purity: 99.95%;
Size: diameter1.5inch×t
hickness3.5mm;
Surface quality: two sides and cylinder fine ground;
Theoretic weight: 34.2grams;
Actual weight: 34.1grams(1.08troy oz);
On the front side: laser engraved Charles Hatchett, the discoverer's picture, atomic number, standard atomic weight, density, melting point, boiling point and net weight.
On the back side: laser engraved electron configuration per shell, Charles Hatchett's name and the year of discovery;
Main uses: element collection, education, gift and so on.
Please visit our store if you are interested in more element coins marked discoverer's picture.
Thank you.
On Feb-27-22 at 17:15:10 PST, seller added the following information: