Question

valence electronic configuration of VIIIth B group elements is​

Answer 1

Answer:

Explanation:

1:Iron: [Ar] 3d64s²,

2:Ruthenium:[Kr] 4d75s1,

3:Osmium:[Xe] 4f145d66s²,

4:Hassium: 5f14 6d6 7s2.

Hope it helps.