Эрбий ² – Newsexchanger

https://newsexchanger.wordpress.com/2020/03/15/%d1%8d%d1%80%d0%b1%d0%b8%d0%b9-%c2%b2-2/

68 Гольмий ← Эрбий → Тулий.

from together

https://ift.tt/2QfyejS