Chemistry, 31.10.2020 14:00 kalcius9698
9. In what year does the Russian chemist Dimitri Mendeleev started the
development of the periodic table, arranging chemical elements by atomic
mass?
A. 1866
B. 1867
C. 1868
D. 1869
10. How many elements are there in the formula: Ca(OH).
B. 3
C. 7
D. 8
Answers: 2
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9. In what year does the Russian chemist Dimitri Mendeleev started the
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