Chemistry · Classification of Elements and Periodicity in Properties
The statement that is not correct for periodic classification of elements is:
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- 1The properties of elements are periodic function of their atomic numbers.
- 2Non-metallic elements are less in number than metallic elements.
- 3For transition elements, the 3d-orbitals are filled with electrons after 3p-orbitals and before 4s-or bitals.✓
- 4The first ionisation enthalpies of elements generally increase with increase in atomic number as we go alo ng a period.
Correct answer
For transition elements, the 3d-orbitals are filled with electrons after 3p-orbitals and before 4s-or bitals.
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