Quantum Mechanical Model Of Atom
Chapter Name : Structure Of Atom |
Sub Topic Code : 102_11_02_06_07 |
Topic Name : Quantum Mechanical Model Of Atom |
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Sub Topic Name : Stability Of Completely Filled And Half Filled Atomic Orbitals |
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Introduction
• Stability of half-filled and fully filled orbitals is due to the following factors : - The symmetric distribution of electrons in the orbitals: More the symmetry, more the electron stability. - The exchange of energy: As an electron is present in each orbital, there are more positions for exchange of electrons, more energy is thus released and hence there is greater electron stability.
Pre-Requisites:
• Definition of atom and its constituents. • Quantum numbers and orbitals. • Energy of orbitals. • Filling of orbitals in an atom. • Electronic configuration.
Real Life Question:
Why do elements like copper and chromium have an electronic configuration of d5 and d10, when according to the conventional rules it should be d4 and d9?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
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| Atomic Orbital | The wave function of an electron in an atom or molecule, indicating the electron's probable location. |
| Electronic configuration | It is a notation which shows the distribution of electrons of an atom in its atomic orbitals (e.g. : s, p, d, f) |
Learning aids / Gadgets
| Gadgets | How it can be used |
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Practical examples around us
| Examples | Explainations |
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What you learn in Theory:
Reasons for greater stability of half filled and fully filled subshells.