Which of the following statement (s) is/...

Which of the following statement `(s)` is`//`are correct ?

Mendeleev's periodic law was based on atomic number of the element.

Zero group was not present in the periodic table when Mendeleev presented it.

The effective nuclear charge `(Z_(eff))` is the atomic number minus shielding effect.

There are four transition series in the periodic table each one consists of `10` elements.

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The correct Answer is:

B, C, D

Statement (b,c and d) are correct.
a. False. Thus law was based on atomic masses of the elements.

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