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Number of Elements in a Period

1. Mendeleev'...

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1. Mendeleev's periodic table did not have noble gases in it. Then how come Ar, Ca be placed as anomalous pair( pair in which heavier mass elent has been placed first with the lighter mass element next)?

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Q. In the periodic table as formulated by Mendeleev, which of the following constitute an anomalous pair of elements?

Q. The elements having more masses were placed before elements having lower masses in Mendleev's periodic table. Guess the pair of elements (higher mass, lower mass).

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