The document discusses shielding and screening in atoms. Shielding refers to the reduction of the true nuclear charge on the atom's nucleus by the electrons in other orbitals. Screening is the same concept as shielding. The effective nuclear charge (Zeff) experienced by an electron is calculated as Zeff = Z - σ, where Z is the atomic number and σ is the shielding constant. While the energy of an electron is proportional to Z2/n2, the energy required to remove an electron does not continuously increase with atomic number due to shielding effects of inner electrons.
1 of 8
More Related Content
Shielding or screening effect
1. Shielding or Screening
Dr. Mithil Fal Desai
Shree Mallikarjun and Shri Chetan
Manju Desai College Canacona Goa
5. Shielding
The reduction of the true nuclear charge to
effective nuclear charge by other electrons is
called shielding.
6. Energy of electron, atomic number,
principal quantum number
Energy of electron is a
function of Z2/n2
Does this mean that energy
required to remove
electron from an atom
continuously increases
with the atomic number?
Z n Z2/n2
1 1 1
2 1 4
3 2 2.25
4 2 4
5 2 6.25
6 2 9
7 2 12.25
8 2 16
9 2 20.25
7. Why this is not true?
A) Average radius of 2s
orbital is greater
than 1s.
A) 2s electrons are
repelled by 1s
electrons.
Nucleus
e-
8. Remember!
• Shielding and screening decreases the true nuclear
charge.
• Shielding constant can be measured following the
Slater rules
