CBSE Class 10 Science 2017 · Paper 31/1/1/C · Question 4
State Modern Periodic Law. What is number of groups and periods in the Modern Periodic Table ?
Answer
Properties of elements are a periodic function of their atomic number; the table has 18 groups and 7 periods.
Modern Periodic Law: Properties of elements are a periodic function of their atomic number.
The Modern Periodic Table has groups (vertical columns) and periods (horizontal rows).
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