Is there is a reason why the elements in that 'family' tend to be more satisfied with having their higher s orbitals half filled before their d orbitals and another thing, why is it that from Sc to Zn its size remains static (that is strange considering its Z eff is increasing)? There's also got to be a reason why some transition metals, ie, Cu, Ag, Au happen to appear shinier than others and I suspect it has alot to do with its electron config. Cu has 1s22s22p63s23p64s13d10. Silver has 1s2s22p63s23p64s23d104p65s14d10. What is it that makes light behave the way it does when it backscatters from these elements?