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  2. Block (periodic table) - Wikipedia

    en.wikipedia.org/wiki/Block_(periodic_table)

    A block of the periodic table is a set of elements unified by the atomic orbitals their valence electrons or vacancies lie in. [1] The term seems to have been first used by Charles Janet. [2] Each block is named after its characteristic orbital: s-block , p-block , d-block , f-block and g-block .

  3. Aufbau principle - Wikipedia

    en.wikipedia.org/wiki/Aufbau_principle

    The periodic table ignores them and follows idealised configurations. [9] They occur as the result of interelectronic repulsion effects; [7] [8] when atoms are positively ionised, most of the anomalies vanish. [7] The above exceptions are predicted to be the only ones until element 120, where the 8s shell is completed.

  4. Periodic table (electron configurations) - Wikipedia

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

    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 chemically. [1] The construction of the periodic table ignores these irregularities and is based on ideal electron configurations. [2]

  5. Electron configuration - Wikipedia

    en.wikipedia.org/wiki/Electron_configuration

    These blocks appear as the rectangular sections of the periodic table. The single exception is helium , which despite being an s-block atom is conventionally placed with the other noble gasses in the p-block due to its chemical inertness, a consequence of its full outer shell (though there is discussion in the contemporary literature on whether ...

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

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

    Here [Ne] refers to the core electrons which are the same as for the element neon (Ne), the last noble gas before phosphorus in the periodic table. The valence electrons (here 3s 2 3p 3 ) are written explicitly for all atoms.

  7. List of chemistry mnemonics - Wikipedia

    en.wikipedia.org/wiki/List_of_chemistry_mnemonics

    A mnemonic is a memory aid used to improve long-term memory and make the process of consolidation easier. Many chemistry aspects, rules, names of compounds, sequences of elements, their reactivity, etc., can be easily and efficiently memorized with the help of mnemonics.

  8. This could be the periodic table's next element - AOL

    www.aol.com/news/2014-05-03-this-could-be-the...

    The periodic table could soon welcome a new element - it's currently unnamed but known as the super heavy element 117. You might want to sit down - it's time for a science lesson. "It's really ...

  9. Atomic orbital - Wikipedia

    en.wikipedia.org/wiki/Atomic_orbital

    The periodic table may also be divided into several numbered rectangular 'blocks'. The elements belonging to a given block have this common feature: their highest-energy electrons all belong to the same ℓ-state (but the n associated with that ℓ-state depends upon the period). For instance, the leftmost two columns constitute the 's-block'.