Choose the correct alternative from the following:
Which among the following is not an anomalous pair in Mendeleev’s periodic table?

Co, Ni

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Te, I

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Ar, K

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Sc, Ga

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Solution

The correct option is D
Sc, Ga

Anomalous pairs: These are the pairs of elements that have not obeyed the increasing order of atomic masses.
In the pairs (given below) the atomic weights of the 2^nd element is greater than the first element.
Co, Ni
Te, I
Ar, K
In the pair Sc and Ga the behavior is not observed.
The correct option is option ‘d’.

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