* Which of the following is not a member of first transition series (A) Cr (B) Fe (C) Mg (D) Mn
Answers
I think (c) or (d)
.
#Hope it helps...
Magnesium (Mg) is not a member of the first transition series.
Therefore Option C : Mg is correct.
Elements of first transition series are :-
Elements Outer electronic configuration Oxidation states
Sc 3d¹ 4s² +3
Ti 3d² 4s² +2 , +3 , +4
V 3d³ 4s² +2 , +3 , +4 , +5
Cr 3d⁵ 4s¹ +2 , +3 , +5 , +6
Mn 3d⁵ 4s² +2 , +3 , +4 , +5 , +6 , +7
Fe 3d⁶ 4s² +2 , +3 , +4 , +5 , +6
Co 3d⁷ 4s² +2 , +3 , +4
Ni 3d⁸ 4s² +2 , +3
Cu 3d¹⁰ 4s¹ +1 , +2
Zn 3d¹⁰ 4s² +2
Mg is a group 2A element.
Electronic configuration of Mg = 1s² 2s² 2p⁶ 3s².
Oxidation state of Mg = +2