Electron Arrangement

Question 1

What is an electron arrangement ?

Answer 1

• Electrons are arranged in electron shells (energy levels)

- which themselves have sub-shells (sun-levels).

Question 2

What does a sun level consist of ?

Answer 2

Electron orbitals (region of space where electron spends most of its time)

Question 3

How many electrons can each orbital hold ?

Answer 3

Each orbital can hold 2 electrons with opposite spins (clockwise and anti-clockwise)

Question 4

Electrons enter the …… energy orbital available

Answer 4

Lowest

Question 5

What is the order electron orbitals fill up in

Answer 5

1s, 2s, 2p, 3s, 3p, 4s, 3d

Electrons their able to hold:
2,2,6,2,6,2,10

Question 6

In …. the electrons in the …. energy levels are ….. ….. but note when loosing electrons, electrons are lost from …. before ….

Answer 6

Ions 
Highest 
Lost first 
4s
3d

Question 7

Order of Cr as an exception

Answer 7

1s2 2s2 2p6 3s2 3p6 4s1 3d5

Question 8

Order of Cu as an exception

Answer 8

1s2 2s2 2p6 3s2 3p6 4s1 3d10

Question 9

Why are Cr and Cu exceptions ?

Answer 9

Because the 4s and 3d levels being very close in energy