Actinides are the elements with atomic number from:
Correct answer: C. 89 to 103
- A. 97 to 104
- B. 101 to 115
- C. 89 to 103
- D. 36 to 43
Explanation
The actinide series runs from actinium, atomic number 89, through lawrencium, atomic number 103. Thus the range is 89 to 103 inclusive. Students may choose 97 to 104 by confusing the actinides with the later transuranium elements or by shifting the series limits.
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About Electronic Structure of d-Block Elements
The electronic structure of d-block elements covers the filling of the (n-1)d and ns orbitals, general electronic configurations, and the exceptions shown by chromium and copper. It explains how partially filled d orbitals produce variable oxidation states, coloured ions, magnetic behaviour and complex formation, while distinguishing transition elements from elements with completely filled d subshells.
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