Question

A: How many unpaired electrons are there in the predicted ground state configuration of a neutral ruthenium (Ru) atom according to the Aufbau principal?

B: What would be the predicted electron configuration for a Ni2+ ion?

C: How many unpaired electrons are there in the observed ground state configuration of a neutral ruthenium (Ru) atom?

D: Which group (column) of elements in the d-block has a different ground state distribution of electrons in the outermost s and d-orbitals for neutral atoms of each of its three elements?

E: Which elements in the d-block do NOT have the predicted electron configuration for the ground state of a neutral atom according to the Aufbau principal?