What should be the difference in atomic radii between two metal elements to form an alloy?

Determine the name and symbol of the element with atomic number $103$.

The atomic radius of elements of which of the following series would be nearly the same?

Predict which of the following will be coloured in aqueous solution: $Ti^{3+}, V^{3+}, Cu^{+}, Sc^{3+}, Mn^{2+}, Fe^{3+},$ and $Co^{2+}$. Give reasons for each.

$Zr$ $(Z=40)$ and $Hf$ $(Z=72)$ have similar atomic and ionic radii because of :

The components of German silver alloy are: