Some d-block elements are given below.(Cr, Mn, Fe, Co, Ni)(a) Identify

1.	Some d-block elements are given below.(Cr, Mn, Fe, Co, Ni)(a) Identify the element which shows maximum paramagnetic behaviour.(b) Give reason for the highest paramagnetic property of that element.(c) When two electrons are lost from each atom, is there any change in magnetic properties of each ? Explain?
Answer» (a) Cr (b) Cr- 4s¹ 3d⁵ Mn – 4s² 3d⁵ . Fe – 4s² 3d⁶ Co – 4s² 3d⁷ Ni – 4s² 3d⁸ Since there are six unpaired electrons in Cr, it has the maximum paramagnetic behaviour. (c) Cr²⁺ →3d⁴ Mn²⁺ → 3d⁵ Fe²⁺ → 3d⁶ CO²⁺ → 3d⁷ Ni²⁺ → 3d⁸ when two electrons are lost, Mn²⁺ contains maximum number of unpaired electrons ie., Mn²⁺ is the ion with maximum paramagnetic behaviour. Cr²⁺ and Fe²⁺ show similar paramagnetism and so on.

Some d-block elements are given below.(Cr, Mn, Fe, Co, Ni)(a) Identify the element which shows maximum paramagnetic behaviour.(b) Give reason for the highest paramagnetic property of that element.(c) When two electrons are lost from each atom, is there any change in magnetic properties of each ? Explain?

Answer»

(a) Cr

(b) Cr- 4s¹ 3d⁵
Mn – 4s² 3d⁵ .
Fe – 4s² 3d⁶
Co – 4s² 3d⁷
Ni – 4s² 3d⁸

Since there are six unpaired electrons in Cr, it has the maximum paramagnetic behaviour.
(c) Cr²⁺ →3d⁴
Mn²⁺ → 3d⁵
Fe²⁺ → 3d⁶
CO²⁺ → 3d⁷
Ni²⁺ → 3d⁸

when two electrons are lost, Mn²⁺ contains maximum number of unpaired electrons ie., Mn²⁺ is the ion with maximum paramagnetic behaviour. Cr²⁺ and Fe²⁺ show similar paramagnetism and so on.

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