Electronic Configurations
Study of the general electronic configuration of d-block elements and their common exceptions.
What is Electronic Configurations?
Elements that have incompletely filled d-orbitals in their elemental state or in their common oxidation states.
Key formula / rule: General Electronic Configuration of Transition Elements
Key points
- To state the general electronic configuration of transition elements.
- To explain the reason behind the exceptions in electronic configurations of certain transition elements.
- To write the correct electronic configurations for elements like Chromium and Copper.
- To understand the relationship between electronic configuration and stability.
Common exam trap
Forgetting the exceptions for Chromium and Copper.
Definitions
- Term
Transition Elements
- Meaning
Elements that have incompletely filled d-orbitals in their elemental state or in their common oxidation states.
- Term
Electronic Configuration
- Meaning
The distribution of electrons of an atom or molecule in atomic or molecular orbitals.
Learning objectives
To state the general electronic configuration of transition elements.
To explain the reason behind the exceptions in electronic configurations of certain transition elements.
To write the correct electronic configurations for elements like Chromium and Copper.
To understand the relationship between electronic configuration and stability.
Formulae
- Name
General Electronic Configuration of Transition Elements
- Note
n is the principal quantum number of the outermost shell.
- Expression
(n-1)d1-10 ns1-2
Prerequisites
Basic atomic structure and electronic configuration (Aufbau principle, Hund's rule, Pauli exclusion principle).
Understanding of quantum numbers and atomic orbitals (s, p, d, f).
Periodic trends and classification of elements.
Common mistakes
Forgetting the exceptions for Chromium and Copper.
Confusing the principal quantum number 'n' with '(n-1)'.
Assuming all elements follow the general rule without considering stability principles.
Incorrectly writing the configuration for ions without considering the order of electron removal (outermost shell first).
Keywords
Transition elements
d-block
Electronic configuration
General configuration
Exceptions
Chromium
Copper
Orbital stability
Half-filled
Fully-filled
Practice preview
What is the general electronic configuration of d-block elements?…
easy
Which of the following is an exception to the general electronic configuration of d-block elements?…
medium
Which of the following statements about the electronic configurations of d-block elements is INCORRECT?…
medium