Which of the following two periods contain the same number of element?
A. 2 & 3
B.3 &...
Chemistry, 06.07.2021 14:00 mktdonaldson
Which of the following two periods contain the same number of element?
A. 2 & 3
B.3 & 4
c. 4 & 6
D. 2 & 4
Answers: 3
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