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  2. Electron configuration - Wikipedia

    en.wikipedia.org/wiki/Electron_configuration

    The empty f orbitals in lanthanum, actinium, and thorium contribute to chemical bonding, [26] [27] as do the empty p orbitals in transition metals. [ 28 ] Vacant s, d, and f orbitals have been shown explicitly, as is occasionally done, [ 29 ] to emphasise the filling order and to clarify that even orbitals unoccupied in the ground state (e.g ...

  3. Atomic orbital - Wikipedia

    en.wikipedia.org/wiki/Atomic_orbital

    The repeating periodicity of blocks of 2, 6, 10, and 14 elements within sections of periodic table arises naturally from total number of electrons that occupy a complete set of s, p, d, and f orbitals, respectively, though for higher values of quantum number n, particularly when the atom bears a positive charge, energies of certain sub-shells ...

  4. List of chemistry mnemonics - Wikipedia

    en.wikipedia.org/wiki/List_of_chemistry_mnemonics

    The order of sequence of atomic orbitals (according to Madelung rule or Klechkowski rule) can be remembered by the following. [2] Order in which orbitals are arranged by increasing energy according to the Madelung rule. Each diagonal red arrow corresponds to a different value of n + l.

  5. Electron configurations of the elements (data page) - Wikipedia

    en.wikipedia.org/wiki/Electron_configurations_of...

    For each atom the subshells are given first in concise form, then with all subshells written out, followed by the number of electrons per shell. For phosphorus (element 15) as an example, the concise form is [Ne] 3s 2 3p 3.

  6. Electron shell - Wikipedia

    en.wikipedia.org/wiki/Electron_shell

    In chemistry and atomic physics, an electron shell may be thought of as an orbit that electrons follow around an atom's nucleus.The closest shell to the nucleus is called the "1 shell" (also called the "K shell"), followed by the "2 shell" (or "L shell"), then the "3 shell" (or "M shell"), and so on further and further from the nucleus.

  7. Spdf - Wikipedia

    en.wikipedia.org/wiki/Spdf

    Spdf or SPDF may refer to: S/PDIF , a format for communicating digital audio across coaxial or fiber optic cabling. Electron configuration , for which there is an obsolete system of categorizing spectral lines as " s harp", " p rincipal", " d iffuse" and " f undamental"; also the names of the sub shells or orbitals

  8. Quantum number - Wikipedia

    en.wikipedia.org/wiki/Quantum_number

    In chemistry, this quantum number is very important, since it specifies the shape of an atomic orbital and strongly influences chemical bonds and bond angles. The azimuthal quantum number can also denote the number of angular nodes present in an orbital. For example, for p orbitals, ℓ = 1 and thus the amount of angular nodes in a p orbital is 1.

  9. Periodic table (electron configurations) - Wikipedia

    en.wikipedia.org/wiki/Periodic_table_(electron...

    Note that these electron configurations are given for neutral atoms in the gas phase, which are not the same as the electron configurations for the same atoms in chemical environments. In many cases, multiple configurations are within a small range of energies and the small irregularities that arise in the d- and f-blocks are quite irrelevant ...