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Which of the following statement is correct in regard to the classification of elements ?

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In modern periodic table, the element Nickel of lower atomic mass is kept before the element Cobalt of higher atomic mass

Elements in Mendeleev’s periodic table are arranged on the basis of increasing atomic numbers

In modern periodic table, the isotopes of chlorine having different atomic masses are kept in the same group

Elements in modern periodic table are arranged on the basis of increasing atomic masses

answer is D.

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Detailed Solution

In modern periodic table the isotopes of chlorine having different masses are kept in the same group because isotopes have same atomic number.

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