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The modern and Mendeleev’s periodic tables considered a _________

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Short, very long

Long, short

Short, long

Short, very short

answer is B.

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Detailed Solution

Mendeleev periodic table has only 7 periods and 8 groups. But the modern periodic table has 7 periods and 18 groups. Therefore, modern and Mendeleev’s periodic tables are considered as “Long and short”.

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