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What does the "first series","second series" and "A", "B" stand for in the Mendeleev's periodic table?

Asked by Isha B 25th January 2014, 12:42 PM
Answered by Expert
Hi Isha, Mendeleev's periodic table contains eight vertical columns of elements called 'groups' and seven horizontal rows called 'periods', Each group has two sub-groups A and B. The properties of elements of a sub-group resemble each other more markedly than the properties of those between the elements of the two sub-groups. First series and second series are periods.
Answered by Expert 30th January 2014, 5:13 PM
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