Which of the following statement about the Mendeleev’s periodic table is correct?
(a) It has 8 vertical columns known as groups.
(b) It has 18 horizontal rows known as periods.
(c) It has 7 horizontal rows known as groups.
(d) It has 18 vertical columns known as periods.
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Mendeleev's periodic table is based on increasing order of atomic weights. It follows the periodic law which states that the physical and chemical properties of elements are a periodic function of their atomic weights. Hence, the statement (i) is incorrect and (iv) is correct.21
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