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In the 19th century, Dmitri Mendeleev predicted the existent of a then unknown element, X, with a mass of 68. He also predicted that an oxide of X would have the formula X2O3, on the modern period table.
asked
Apr 9, 2017
Biology
high-school
1
answer
0
votes
224k
views
A foot of trochee has three syllables. True False
asked
Jan 25, 2017
English
high-school
2
answers
0
votes
207k
views
What as the most common act of terrorism in the 1800s
asked
Jan 5, 2016
History
high-school
2
answers
5
votes
193k
views
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