St. Petersburg, Russia/stpet100
Previous | Home | NextMendeleev's handwritten entries for ytterbium (Yt,89), lanthanum (La, 139), erbium (Er, 170), and Didymium (Di, 175-190; actually a mixture of praseodymium and neodymium).
St. Petersburg, Russia/stpet100Previous | Home | NextMendeleev's handwritten entries for ytterbium (Yt,89), lanthanum (La, 139), erbium (Er, 170), and Didymium (Di, 175-190; actually a mixture of praseodymium and neodymium). |
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