what is meant by periodicity of element ? why are properties of element placed in same group of periodic table are similar ?
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occurrence of characteristic properties of elements at definite interval in the modern periodic table when elements are arranged in increasing order of their atomic number is called periodicity in properties.
they are similar because of similar valence shell electronic configuration.
they are similar because of similar valence shell electronic configuration.
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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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