Exchange energy (Eex) #copper #nitrogen #exchangeenergy

1. Concept of Exchange energy
(Eex)
Dr. Mithil Fal Desai
Shree Mallikarjun and Shri Chetan Manju Desai College
Canacona Goa

2. Exchange energy (Eex)
𝐸𝑒𝑥 = ෍
𝑁(𝑁 − 1)
2
𝐾
Nitrogen[He] 2s2, 2p3
2px 2py 2pz 2px 2py 2pz
N- number of electrons with parallel spin
K- constant
or
Electrons can exchange their position
with other electrons having parallel spin.

3. Exchange energy (Eex)
𝐸𝑒𝑥 = ෍
𝑁(𝑁 − 1)
2
𝐾
2px 2py 2pz 2px 2py 2pz
N- number of electrons with parallel spin
K- constant
or
Electrons can exchange their position
with other electrons having parallel spin.
Nitrogen[He] 2s2, 2p3

4. 𝐸𝑒𝑥 =
3(3 − 1)
2
𝐾
= 3K
𝐸𝑒𝑥 =
2(2 − 1)
2
𝐾
= 1K
Exchange energy (Eex)
𝐸𝑒𝑥 = ෍
𝑁(𝑁 − 1)
2
𝐾
N- number of electrons with parallel spin
K- constant
2px 2py 2pz 2px 2py 2pz
or
Nitrogen[He] 2s2, 2p3

5. 𝐸𝑒𝑥 =
5(5 − 1)
2
𝐾 +
5(5 − 1)
2
𝐾
= 20 K
Exchange energy (Eex)
𝐸𝑒𝑥 = ෍
𝑁(𝑁 − 1)
2
𝐾
N- number of electrons with parallel spin
K- constant
Cu [Ar] 3d10, 4s1 Cu [Ar] 3d9, 4s2
𝐸𝑒𝑥 =
5(5 − 1)
2
𝐾 +
4 (4 − 1)
2
𝐾
= 16 K
Higher the exchange energy more will be the stability of the electronic configuration