[throwaway_yy2Di]

I don't think that's ruthenium -- that graph has a gap at technetium (Z=43), which has no long-lived isotopes. The line actually joins Z=42 and Z=44.

(Might also be confusing that Sn (Z=50) is labelled at the wrong place (Z=48)).

edit: here's a modified version,

https://i.imgur.com/0iQ6vNX.png