Manganese has a total of 25 electrons, but the following orbital notation for manganese is incorrect. Explain the error in terms of the rules for electron arrangements.

Manganese:

Question

Manganese has a total of 25 electrons, but the following orbital notation for manganese is incorrect. Explain the error in terms of the rules for electron arrangements. 

Manganese:

anonymous · Answer

This is the picture http://i.imgur.com/JMItwNL.png

aaronq · Answer

The AUFBAU principle states that orbitals must be filled in order of increasing energy. 4s orbitals are lower in energy than 3d orbitals when first filling in electrons.

aaronq · Answer

i.e. you must first fill in 4s before 3d orbitals

anonymous · Answer

I still don't understand

aaronq · Answer

do you have a periodic table with you?

anonymous · Answer

yes

aaronq · Answer

okay, electrons are filled in a horizontal order from left to right.|dw:1378411543191:dw|

i separated it into blocks so you can see where the orbitals are.

Locate manganese in the periodic table and trace a horizontal line from left to right. You'll see you encounter K and Ca (which are $4s^1\;and\;4s^2$) before manganese.

This is the order the electrons are filled.

anonymous · Answer

Ok but i still don't understand how to answer the question.. :(

aaronq · Answer

Explain the error in terms of the rules for electron arrangements. 

The orbital notation presented violates the AUFBAU principle as orbitals of higher energy (3d) are filled before orbitals of lower energy (4s).

anonymous · Answer

The orbital notation presented violates the AUFBAU principle as orbitals of higher energy (3d) are filled before orbitals of lower energy (4s).

So that is the answer?

aaronq · Answer

yep

anonymous · Answer

ok thank you very very much for explaining it to me :D :D :D

aaronq · Answer

no problem! i do hope you understood it