why do not elements present in a period show similar characteristics
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Explanation:
The elements of a group have similar chemical properties but in a period they have different chemical properties. This is because the chemicals properties depend on no of valence electrons. As in a group all elements have same no of valence electron that's why they have similar chemical properties but in a period the no of valence electron varies that's why they differ in chemical properties.
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because in the same period every element has different valance electron due to which they have different chemical and physical properties. the valence electron even decides if a element is a metal or a non-metal or a metalloid.
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