Question

What is the electron configuration of neptunium?

Answer 1

Is it:
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s2 4d10 5p64f14 5d10 6s2 6p6 7s2 6d1 5f4
or
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s2 4d10 5p64f14 5d10 6s2 6p6 7s2 6d1 5f5

The difference being 5f4 or 5f5. Because 5f5 is correct mathematically, but everywhere i look it says its 5f4.

Answer 2

Its 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f4 6d1

Answer 3

or [Rn] 7s2 5f4 6d1

Answer 4

There are 93 electrons, all together makes up 5f4 , if it were 94 electrons, then its 5f5

Answer 5

Thank you.

Answer 6

Can anyone here help me too?

Answer 7

Where does the 6d^1 come from???