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however, a few remaining holes in the table outside of the bottom rows that would later come to be filled with lab-produced radioactive elements; two of these missing elements were numbers and . both of these elements had been predicted by mendeleev, who had named them ekamanganese and dwimanganese...
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glass. it takes ten years for a shard of glass to show any significant etching, and twenty to thirty years for all jagged edges to be completely polished and rounded by lapping waters. sea glass is the most beautiful consequence of civilization in nature - the classic shapes and colors attract artists...
the penultimate element with stable isotopes to be discovered (followed by rhenium two years later). while working at the bohr institute of theoretical physics in copenhagen, the two chemists identified the new element via x-ray spectroscopy analysis of a zirconium ore and named it "hafnium" after hafnia...