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Classification of Elements and Periodicity in Properties — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryClassification of Elements and Periodicity in Properties1 Mark
MCQ
The statement that is not correct for periodic classification of elements is :
  • A
    The properties of elements are periodic function of their atomic numbers.
  • B
    Non metallic elements are less in number than metallic elements.
  • ✓
    For transition elements, the $3d-$ orbitals are filled with electrons after $3p$ orbitals and before $4s-$ orbitals.
  • D
    The first ionisation enthalpies of elements generally increase with increase in atomic number as we go along a period.
✓

Answer

Correct option: C.
For transition elements, the $3d-$ orbitals are filled with electrons after $3p$ orbitals and before $4s-$ orbitals.
For transition elements, the $3d-$ orbitals are filled with electrons after $3p$ and $4s-$ orbitals and before $4p-$ orbitals.
The order of filling the orbitals is.
Is $,\ce{2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, …}$

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