Question

Why does the density of transition elements increase from Titanium to Copper? (at. no. Ti = 22, Cu = 29)

There is an increase in density of elements from titanium (Z = 22) to copper (Z = 29) in the 3d series of transition elements.

Explain the following:

There is an increase in density of elements from titanium (Z = 22) to copper (Z = 29) in the 3d series of transition elements.

Answer 1

1. Atomic mass rises from Ti to Cu because each element has more protons and neutrons.
2. Atomic/metallic volume falls slightly across the 3d series (added d‑electrons give poor shielding and pull the atoms in).
3. Since density = mass/volume, increased mass plus smaller volume makes density increase from Ti to Cu (Zn is an exception due to larger atomic volume).