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Which of the following is not a merit of...

Which of the following is not a merit of Mendeleev's original periodic table?
a) Prediction of undiscovered elements and their properties
b) Correction of atomic masses of a few elements
c) Systematic arrangement of elements based on atomic mass
d) Similar elements were placed in different groups
e) Separate positions are given for isotopes
f) Order of increasing atomic weight is not observed. The correct code is

A

a, b, c

B

a, b, d

C

d, e, f

D

c, d, e, f

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