Question

why is ruthenium an exception?

Answer 1

Hey mate☺☺

↪Ruthenium of atomic no. 44 it is only 8th group element which haven't 2 electrons in outer shell. That's why it is exception.


✨hope it helps u⭐⭐⭐

Answer 2

In Ruthenium due to d-d separation dxy, dyz, dzx have less energy then dx2-y2 and dz2 have greater energy thus d3,d8 configurations becomes more stable. In Ruthenium energy for transition is more hence go to d7.