What is meant by periodicity of properties of elements? Why are the properties of elements
placed in the same group of the periodic table similar?
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Answer:
The periodic repetition of the properties is due to the recurrence of similar valence shell configuration after certain regular interval. So, because the elements in a group have similar electronic configuration, they have same number of valence electrons and therefore they show similar chemical properties
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repetition of properties after a certain interval is called the periodicity properties of elements.
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