Exceptions in Electron Configuration

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Questions and Answers

What happens to electrons with a configuration of $s^2 3d$?

$s^1 3d10$ (correct)

$s^1 3d5$

$s^2 3d9$

$s^0 3d10$

Which of the following elements are exceptions for the electron configuration?

Au (correct)

Cu (correct)

Mo (correct)

Cr (correct)

What are the three causes for ionization energy exceptions?

Shielding, Number of Protons, Distant, Repulsion

Explain the ionization energy exception for shielding.

Ionization energy decreases from Be to B because the electron removed from B is farther away from the nucleus due to extra shielding. Signup and view all the answers

Which pairs show exceptions in ionization energies for shielding?

(Be & B) Signup and view all the answers

Ionization energy exceptions for shielding occur in configurations changing from s2 to p1.

True Signup and view all the answers

What is the ionization energy exception related to protons?

Atoms with more protons have higher ionization energies due to stronger attraction. Signup and view all the answers

What does the ionization energy exception related to distance indicate?

The p1 electron is farther from the nucleus than the 3d1 electron, making it easier to remove. Signup and view all the answers

Which pairs exhibit ionization energy exceptions for distance?

(Zn & Ga) Signup and view all the answers

What is the cause of the decrease in ionization energy related to repulsion?

Extra repulsion from paired electrons causes less attraction and decreases ionization energy. Signup and view all the answers

Identify the pairs that indicate ionization energy exceptions due to repulsion.

(As & Se) Signup and view all the answers

In which configurations do exceptions for repulsion as a cause of decreased ionization energy occur?

p3 to p4 Signup and view all the answers

Describe the atomic radius exception that occurs in 3d10 to 4p1.

Atomic radius increases because the p1 electron is va;ence while the d10 electron is not. Signup and view all the answers

What is the reason for exceptions in electron affinity?

Filled or half-filled sublevels are more stable Signup and view all the answers

Electron affinity exceptions can occur in which configurations?

s2 Signup and view all the answers

Study Notes

Electron Configuration Exceptions

Electrons typically transition from s² 3d to s¹ 3d¹⁰.
Notable elements for electron configuration exceptions include Cr, Mo, Cu, Ag, and Au.

Ionization Energy Exceptions

Ionization energy varies due to several factors: shielding, number of protons, electron distance, and repulsion.
Shielding can cause a decrease in ionization energy in elements like Be and B.

Shielding and Ionization Energy

Ionization energy decreases from Be to B as 2p¹ electron is farther from the nucleus, resulting in less attraction due to the shielding effect of 2s² electrons.
Common pairs exhibiting this trend are Be & B and Mg & Al.

Distant Electrons and Ionization Energy

Higher energy levels (s² to p¹) face ionization energy decreases; for example, p¹ electrons are farther from the nucleus than d¹ electrons, leading to weaker attractions.
Exceptions noted in pairs include Zn & Ga, Cd & In, and Hg & Tl.

Repulsion Factors in Ionization Energy

The presence of paired electrons (like in oxygen) leads to decreased ionization energy compared to unpaired configurations (like in nitrogen).
This phenomenon is observed in pairs such as N&O, P&S, and As & Se.

Atomic Radius Exceptions

Atomic radius typically decreases; however, in the transition from 3d¹⁰ to 4p¹, it increases due to p¹ electrons being valence and farther from the nucleus compared to d electrons.

Electron Affinity Exceptions

Electron affinity decreases when a sublevel is either completely filled or half-filled, as adding an electron destabilizes the atom.
Stability is observed in configurations like s², 3d¹⁰, and in the 3p block due to their filled or half-filled states.

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Description

Explore the fascinating exceptions in electron configuration and ionization energy. This quiz focuses on specific elements and the reasons behind their deviations from expected periodic trends. Test your knowledge of concepts such as shielding, repulsion, and electron configuration adjustments.