First slide

Periodicity in atomic properties

Question

Which set has all the coloured ions?

Moderate

A

${Cu}^{+}, {Cu}^{2 +}, {Ni}^{2 +}$
B

${Cu}^{2 +}, {Fe}^{2 +}, {Co}^{2 +}$
C

${Cu}^{2 +}, {Co}^{2 +}, {Sc}^{3 +}$
D

${Na}^{+}, {Mg}^{2 +}, {Al}^{3 +}$

Solution

Cu⁺ is colourless and Sc³⁺ is colourless.
${Na}^{+}, {Mg}^{2 +}, {Al}^{3 +}$ --colourless
as they have no unpaired electron in d-orbitals.

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