Single Choice

Which of the following does not represent the correct order of the property indicated?

A$$Sc^{3+}>Cr^{3+}>Fe^{3+}>Mn^{3+}$$ ___ ionic radii
Correct Answer
B$$Sc< Ti< Cr< Mn$$ ___ density
C$$Mn^{2+}> Ni^{2+}> Co^{2+}< Fe^{2+}$$ ___ ionic radii
D$$FeO< Cao< MnO< CuO$$ ____ basic nature

Solution

The correct order of ionic radii is $$Sc^{3+}> Cr^{3+}> Fe^{3+}> Mn^{3+}$$.
Electronic configuration of $$Sc^+3$$ is $$3d^0$$, $$Cr^{+3}$$ is $$3d^3$$, $$Fe^{+3}$$ is $$3d^5$$, $$Mn^{3+}$$ is $$3d^4$$.
Since electrons are entering d orbital there is increase in nuclear charge so initially there is contraction in radius. Eventually there is increase in radius due to increased screening of outer electrons.

SIMILAR QUESTIONS

d - block and f - block Elements

The atomic radius of $$Ag$$ is closed to :

d - block and f - block Elements

Give reason for: $$Zr$$ and $$Hf$$ have almost identical radii.

d - block and f - block Elements

Account for: Silver atom has completely filled $$d$$-orbitals ($$4d^{10}$$) in its ground state yet silver is a transition element.

d - block and f - block Elements

The decreases in atomic volume from Cr to Cu is very negligible because

d - block and f - block Elements

The atomic radii of the elements are almost same of which series:

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