what is meant by periodicity of properties of elements?why are the properties placed in the same group of the periodic table similar?
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Answer: Repetition of elements with similar electronic configuration is periodicity
The elements placed In a same group has similar properties because they have similar outer electronic configuration of electrons
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The occurrence (or arrangement) of the elements with similar properties after certain regular interval when they are arranged in increasing order of atomic number is called periodicity. 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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