4. At the time of Mendeleev, the number of elements known was (a) 63

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4. At the time of Mendeleev, the number of elements known was (a) 63 (b) 65 (c) 62 (d) 64

4. At the time of Mendeleev, the number of elements known was
(a) 63
(b) 65
(c) 62
(d) 64

1 Answers

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