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Chemistry · Classification of Elements and Periodicity in Properties
हिन्दीConsider the following statements regarding transition and inner-transition series: (A) The d-block elements form a bridge between the chemically active metals of s-block and less active elements of Groups 13 and 14. (B) Zn, Cd and Hg have electronic configuration (n-1)d^10ns^2 and do not show most of the characteristic properties of transition elements. (C) The inner-transition elements are characterized by the filling of f-orbitals belonging to (n-2) energy level. (D) All lanthanoids and actinoids are man-made radioactive elements. Which of the above statements are correct?
Correct answer · Option 1
(A), (B) and (C) only
Explanation
Statement (D) is incorrect because only actinoids are radioactive and many are man-made, whereas lanthanoids occur naturally (except promethium). Statements (A), (B), and (C) are correct.
