Chemical Symbols 61-90
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Signs and symbols of the 61st to 90th chemical elements of the periodic table. "Chemical symbol," Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/w/index.php?title=Chemical_symbol&oldid=953572147 (accessed May 14, 2020).
Description
30
Questions
10 sec
Per question
0:41
Average time
3.0
Contest Score
4
Participants
Question 10: there are two times the answer Yb.