Q.

Which of the following pairs were incorrectly arranged in Mendeleev's Periodic table?

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a

Co-Ni

b

ArK

c

Te-I 

d

Th-Pa

answer is A, B, C, D.

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Detailed Solution

Pairings of elements that do not follow the ascending order of atomic masses are known as anomalous pairs. Mendeleev arranged these elements not in ascending order of atomic mass but rather according to similarities in their properties.

Ar ( at mass = 39.9) is placed before K (at mass = 39.1)
Co (at mass =  58.9) is placed before Ni (at mass = 58.6)
Te (at mass = 127.6 ) is placed before I (at mass = 126.9)
Th (at mass = 232.0381 ) is placed before Pa (at mass = 231.0359)

 

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