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Answer the following.
(1) Why does the density of transition elements increase from Titanium to Copper? (at. no. Ti = 22…
(1) Why does the density of transition elements increase from Titanium to Copper? (at. no. Ti = 22, Cu = 29)
(2) Why is zinc not regarded as a transition element? (at. no. Zn = 30)
Answer
Answer
AI(1) Because the atomic size decreases (atomic volume decreases) from Ti to Cu as the nuclear charge increases, while the atomic mass increases, so the density increases.
(2) Because zinc ($3d^{10}4s^2$) has a completely filled d-orbital in its atom and in its common ion $\mathrm{Zn^{2+}}$ ($3d^{10}$), so it has no partly filled d-orbitals.
From ISC 2018 Chemistry Paper 1, question 1(d)(i).