[Rn] 6s24f145d6 is an invalid abbreviated electron configuration, the closest electron configuration would probably be [Xe] 6s24f145d6 which would be iridium (Ir), or if you meant [Rn] 7s25f146d6, it would be Meitnerium (Mt).
[Kr] 4d10 5s2 5p5
[Xe] 6s2 4f14 5d10 6p3
The electron configuration of lead is [Xe] 4f14 5d10 6s2 6p2.
Electronic configuration of hafnium: [Xe].4f14.5d2.6s2 And in simpler form 2, 8, 18, 32, 10, 2
[Xe] 4f14 5d10 6s2 6p2
Element Os
[Kr] 4d10 5s2 5p5
There are two notations. The classical notation: 2.8.8.18.18.22 The Quantum notation: [Xe]6s^2 4f^14 5d^6 (spaces added for ease of reading only)
The abbreviated electron configuration for Pt is [Xe] 6s1 4f14 5d9. also, the configuration for Pt2+ ion is [Xe] 4f14 5d8
[Xe] 6s2 4f14 5d10 6p3
The electron configuration of lead is [Xe] 4f14 5d10 6s2 6p2.
Electronic configuration of hafnium: [Xe].4f14.5d2.6s2 And in simpler form 2, 8, 18, 32, 10, 2
[Xe] 4f14 5d10 6s2 6p2
W this is the chemical symbol and is acceptable as a shorthand answer
There are 85 electrons in astatine. Its noble gas notation is [Xe] 4f14 5d10 6s2 6p5
[Xe] 4f14 5d4 6s2
[Xe] 4f14 5d10 6s2 6p2