Concept explainers
Interpretation:
The block in the Mendeleev’s table which is more like today’s placement needs to be determined. Also, which is least like today’s placement needs to be determined.
Concept introduction:
According to Mendeleev’s periodic law the elements are arranged according to their atomic weights.

Answer to Problem 99A
Group (VII) of Mendeleev’s table is most and group (0) of the Mendeleev’s table is least like today’s placement.
Explanation of Solution
Group (VII) is the second to a large group in the Mendeleev’s table. This group of Mendeleev’s table is most closely resembles today’s table. In group (VII) the elements are ordered correctly with the exception of manganese.
Group (0) of Mendeleev’s table is places the noble gases and it is the far left rather than a right of the table. Thus it is least like today’s table.
Group (0) of the Mendeleev’s table is least like today’s placement and group (VII) of Mendeleev’s table is most today’s placement.
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