Question

2. Modern periodic law states that the physical
and chemical properties of elements are the
periodic functions of their
a) atomic numbers b) atomic masses
c) similarities d) anomalies
3. Elements in the modern periodic table are
arranged in groups and periods.
a) 7, 18 b) 18,7 c) 17,8 d) 8,17
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Answer 1

Answer:

In modern periodic table there are 18 groups and 7 periods. So option b is right