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Q.

In the periodic table, inversion of atomic weights took place in this pair 

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a

Hydrogen – Helium

b

Boron – Scandium

c

Beryllium – Boron

d

Argon – Potassium

answer is A.

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Detailed Solution

Inversion of atomic weights means higher atomic weight follows lower atomic weight.     

Ar40  K39 are called Anomalous pairs.

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