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The d-And-f-Block Elements
Question
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Of the ions Co2+, Sc3+ and Cr3+ which one will give coloured aqueous solutions and will have each of them respond to a magnetic field and why? [Atomic numbers, Co = 27, Sc = 21, Cr = 24]

Answer

The transition element exhibit color and magnetic property due to unpaired electron.Co2+ has electronic configuration [Ar] 4s03d7 has seven unpaired electron, Cr3+ has [Ar] 4s03d3 has three unpaired electrons, therefore, they will form coloured solution whereas Sc3+ [Ar] 4s03d0 has no unpaired electron, it will form colourless solution.
Co2+ and Cr3+ will be attracted by magnetic field due to presence of unpaired electrons whereas Sc3+ will be repelled by magnetic field because it does not have unpaired electrons.

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Some More Questions From The d-And-f-Block Elements Chapter

Actinoid contraction is greater from element to element than lanthanoid contraction. Why?

On what ground can you say that scandium (Z = 21) is a transition element but zinc (Z = 30) is not?

The outer electronic configuration of copper is 3d10 4s1, yet it is considered transition element. Why?

Why the melting points of transition elements are high?

Why Zn, Cd and Hg are not regarded as transition elements?

Name the first element of 3rd transition series.

Though copper, silver and gold have completely filled sets of d-orbitals yet they are considered as transition metals. Why?

Why are transition elements so named?

Why are transition elements known as d-block elements?

Write the general electronic configuration of d-block elements.