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An Intiative by Sri Chaitanya
a
Mendeleev's periodic law was based on atomic numbers of the element.
b
Zero group was not present in the periodic table when Mendeleev presented it.
c
The effective nuclear charge (Zeff) is the atomic number minus shielding effect.
d
There are four transition series in the periodic table each one consists of 10 elements.
answer is B.
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