Ne 3s2 would be Magnesium, and Ar 3d6 4s2 is Iron.
For the first one you look at neon and count 2 "s" electrons after, which puts you at Mg.
For the latter, you look at Argon, count 2 "4s" electrons then 6 "3d" electrons. and you'll end up on Fe.
The noble gas notation for Iron (Fe) is [Ar]4s2 3d6.
[Ar] 3d6, 4s2
It is [Ar] 3d6 4s2.
Br - 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5The noble gas notation form isBr- [Ar] 4s2 3d10 4p5Br- ion has 36 electrons and has the same electronic configuration as the noble gas krypton.Its noble gas notation is [Ar] 3d10 4s2 4p6
[Ar] 4s2 3d10 4p1
The noble gas notation for Iron (Fe) is [Ar]4s2 3d6.
[Ar] 3d6, 4s2
Fe(III) is 3d5 this is because Fe(0) is 3d6 4s2
1s2 2s2 2p6 3s2 3p6 4s2 3d6 That is for an iron atom. If you mean an Fe+3 ion 1s2 2s2 2p6 3s2 3p6 3d5
It is [Ar] 3d6 4s2.
Br - 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5The noble gas notation form isBr- [Ar] 4s2 3d10 4p5Br- ion has 36 electrons and has the same electronic configuration as the noble gas krypton.Its noble gas notation is [Ar] 3d10 4s2 4p6
[Ar] 4s2 3d10 4p1
[Ne] 3s2 3p4See the notes on the Noble Gas configuration of Barium.Noble_gas_notation_for_barium
1s2 2s2 2p6 3s2 3p6 3d6 fe 2+: remove the electrons from the highest orbital which 4S2
The noble gas electronic configuration of iron is [Ar] 3d6 4s2
Electron Notation is: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p2 Noble Gas notation is: [Ar] 4s2 3d10 4p2 Orbital Notation would be with the up & down arrow in boxes for each orbital.
Mg: 1s2- 2s2 - 2p6 - 3s2