Electron Configuration for Iron

[Quincy]

I just need to refresh my memory:

When writing electron configurations for elements in the d block such as Iron (Fe), would you write it like this: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 4d⁶

OR

like this: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 4p⁶ 4d⁶

 

[Ygggdrasil]

I just need to refresh my memory:

When writing electron configurations for elements in the d block such as Iron (Fe), would you write it like this: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 4d⁶

This is perfectly acceptable except it's 3d⁶, not 4d⁶.

like this: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 4p⁶ 4d⁶

This is incorrect. It has too many electrons.

 

[Quincy]

This is perfectly acceptable except it's 3d⁶, not 4d⁶.

isn't Iron in the 4th period though?

 

[Borek]

isn't Iron in the 4th period though?

It doesn't matter. You can't fill 4d before 3d.

 

[Quincy]

Write the electron configuration (long way) for yttrium:

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 5d¹

-- is that correct?

 

[Borek]

No. You have just ignored my previous post.

 

[Quincy]

Sorry; how about this:
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹

how about this one: Write the electron configuration using the Noble Gas shortcut for mendeleevium:

[Rn] 7s² 6f¹³