State the modern periodic law for classification of elements. How many (a) groups and (b) periods are there in the modern periodic table ?
State the modern periodic law for classification of elements. How many (a) groups and (b) periods are there in the modern periodic table ?
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"Properties of elements are the periodic function of their atomic number."
(i) There are 18 groups.
(ii) There are 7 periods in the modern periodic table.
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