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What is the significance of first 20 elements in theperiodic table?

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What is the significance of first 20 elements in theperiodic table?

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  1. the first 20 elements are adding electrons to the outside shell S &/or P orbitals, they have no electrons in D or F orbitals

    with # 21 you start the transition elements whiich begin to put electrons in underneath shell D- orbitals

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