First slide

Classical approach of classification of elements

Question

Which of the following triads have approximately equal size?

Moderate

A

${Na}^{\oplus}, {Mg}^{2 +}, {Al}^{3 +} (isoelectronic)$
B

$F^{⊖}, Ne, O^{2 -} (isoelectronic)$
C

$Fe, Co, Ni$
D

${Mn}^{1 +}, {Fe}^{2 +}, Cr (isoelectronic)$

Solution

Triads of group VIII (groups 8,9 and l0) have approximately the same size, e.g.
Ist triad, Fe, Co, Ni
IInd triad, Ru, Rh, Pd
IIIrd triad, Os, Ir, Pt.

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