According to mendeleev’s periodic law, the elements were arranged in the periodic table in the order of

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Decreasing atomic number

Increasing atomic masses

Increasing atomic number

Decreasing atomic masses

answer is C.

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Detailed Solution

According to Mendeleev's periodic law, the elements were arranged in the periodic table in order of increasing atomic masses.
This means that the chemical and physical properties of the element recur periodically when the elements are arranged in the increasing order of their atomic masses. In Mendeleev's periodic table there were 63 elements arranged in 8 columns called groups and 7 rows called periods.

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