Mole., Chemistry

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Following Hund's rule which element contains six unpaired electron: (1) Fe     (2) Co       (3) Ni    (4) Cr Ans: Cr

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GROUP 12: ZINC, CADMIUM, AND MERCURY   Group 12 substance have the electron design ( n -1) d 10 ns 2 with n =4, 5 and 6 for Zn, Cd and Hg, respectively. They are formally pa

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