CBSE Class 10 Science 2020 · Paper 31(B) · Question 16
State the Modern Periodic Law. In how many groups and periods is the Modern Periodic Table of elements divided ? The atomic number of an element is 16. Write its period and valency.
Answer
Properties of elements are a periodic function of atomic number; 18 groups, 7 periods; atomic number 16 gives period 3 and valency 2.
Modern Periodic Law: properties of elements are a periodic function of their atomic number.
The Modern Periodic Table has groups and periods.
For atomic number the electronic configuration is (K, L, M), so the element lies in period (three occupied shells) and its valency is .
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