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  2. List of chemical elements - Wikipedia

    en.wikipedia.org/wiki/List_of_chemical_elements

    118 chemical elements have been identified and named officially by IUPAC.A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z).

  3. List of search engines - Wikipedia

    en.wikipedia.org/wiki/List_of_search_engines

    Major desktop search program. The full trial version downgrades after the trial period automatically to the free version, which is (anno 2018) limited to indexing a maximum of 10.000 files. Proprietary (30 day trial) DocFetcher: Cross-platform Open-source desktop search tool for Windows and Linux, based on Apache Lucene: Eclipse Public License

  4. Nitrogen - Wikipedia

    en.wikipedia.org/wiki/Nitrogen

    Free nitrogen atoms easily react with most elements to form nitrides, and even when two free nitrogen atoms collide to produce an excited N 2 molecule, they may release so much energy on collision with even such stable molecules as carbon dioxide and water to cause homolytic fission into radicals such as CO and O or OH and H. Atomic nitrogen is ...

  5. Languages of India - Wikipedia

    en.wikipedia.org/wiki/Languages_of_India

    Languages spoken in the Republic of India belong to several language families, the major ones being the Indo-Aryan languages spoken by 78.05% of Indians and the Dravidian languages spoken by 19.64% of Indians; [5] [6] both families together are sometimes known as Indic languages.