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How would you justify the presence of 18...

How would you justify the presence of 18 elements in the 5th period of the periodic table. 

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When n= 5, L = 0, 1, 2, 3. The order in which the energy of the available orbitals 4d, 5s and 5p increases is 5s < 4d < 5p. The total number of orbitals available are 9. The maximum number of electrons that can be accommodated is 18 and therefore 18 elements are there in 5th period.
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Knowledge Check

  • Elements of the same vertical group of the periodic table have

    A
    same atomic size
    B
    same electronic configuration
    C
    same number of electrons in outermost shell of their atoms
    D
    same number of atoms

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