Question

list some anamolous pairs of elements which were found in mendeleevs periodic table other than Cobalt and Nickle

Answer 1

(A) Ar and K: The atomic mass of argon is 40 and that of potassium is 39, But argon is placed before potassium in the periodic table.

(B) Te and I: Tellurium (at. wt. = 127.6) is placed before iodine (at. wt = 126.9).

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Answer 2

Tellurium of atomic mass 127.76 placed before iodine of atomic mass 127