What is electron configuration of Bi5+?

No, it should be as stated. While it may be true that the 4f and 5d levels are filled before the 6s or the 6p, the fact is that 6s and 6p are the OUTSIDE shells and those are the VALENCE electrons. So you remove the outside electrons from the outside shells leaving you with [Xe] 4f14 5d10 for the Bi+5 ion.

Here is the Bi neutral atom electron configuration. Take the last five electrons away to make the Bi^+5 ion.

http://www.webelements.com/webelements/elements/text/Bi/econ.html

Well, I hate to break it to you, but Bi5+ doesn't exist. Bismuth (Bi) has an atomic number of 83, which means it has 83 electrons. However, when an atom loses electrons to become a cation, it loses them one at a time, starting with the outermost electrons. So, it's not possible for bismuth to form a 5+ cation. It's like trying to fit a square peg into a round hole, it's just not gonna happen! But hey, at least you learned something new today, right?

I don't understand why it's like that -

4f14.5d10.6s2.6p3

Shouldn't it be 6s2.4f14.5d10.6p3
And then with the charge 6s2.4f14.5d8

To determine the electron configuration of an ion, in this case Bi5+, we need to first know the electron configuration of the neutral atom, which is Bismuth (Bi).

The electron configuration of a neutral Bismuth atom can be found by referring to the periodic table. Bismuth is in period 6 and belongs to Group 15. Its atomic number is 83, which means it has 83 electrons.

The electron configuration of Bismuth (Bi) is:
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p³

Now, to determine the electron configuration of Bi5+ (Bismuth ion with a +5 charge), we need to remove five electrons from the neutral atom.

Starting from the highest energy level or the outermost shell, we remove electrons in the following order: 6s², 4f¹⁴, 5d¹⁰, 6p³.

Therefore, the electron configuration of Bi5+ is: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶.

Note: After removing the five electrons, we end up with the noble gas configuration of Xenon (Xe) since Xenon's electron configuration is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶.