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14 Αυγ 2020 · Oxygen (atomic number 8) has a pair of electrons in any one of the 2 p orbitals (the electrons have opposite spins) and a single electron in each of the other two. Fluorine (atomic number 9) has only one 2 p orbital containing an unpaired electron.
Bohr’s model of the hydrogen atom, proposed by Niels Bohr in 1913, was the first quantum model that correctly explained the hydrogen emission spectrum. Bohr’s model combines the classical mechanics of planetary motion with the quantum concept of photons.
Shells, subshells, and orbitals. Introduction to electron configurations. The Aufbau principle. Valence electrons. Electron configurations of ions. Electron configurations of the 3d transition metals. Atomic structure and electron configuration.
Each wave function with an allowed combination of n, l, and ml values describes an atomic orbital , a particular spatial distribution for an electron. For a given set of quantum numbers, each principal shell has a fixed number of subshells, and each subshell has a fixed number of orbitals.
Describe the hydrogen atom in terms of wave function, probability density, total energy, and orbital angular momentum. Identify the physical significance of each of the quantum numbers (n, l, m) of the hydrogen atom. Distinguish between the Bohr and Schrödinger models of the atom.
Learning Objectives. Understand the general idea of the quantum mechanical description of electrons in an atom, and that it uses the notion of three-dimensional wave functions, or orbitals, that define the distribution of probability to find an electron in a particular part of space.
Core Concepts. In this tutorial, you will learn about electron shells, the different subshells, and the orbitals where electrons can be found. Topics Covered in Other Articles. How to Write Electron Configurations. Electron Orbitals and Orbital Shapes. Sigma and Pi Bonds. Valence Bond Theory. Bohr Model of the Atom. The Bohr Model.
