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2. Periodic table - Wikipedia

   en.wikipedia.org/wiki/Periodic_table

   A recognisably modern form of the table was reached in 1945 with Glenn T. Seaborg's discovery that the actinides were in fact f-block rather than d-block elements. The periodic table and law are now a central and indispensable part of modern chemistry. The periodic table continues to evolve with the progress of science.

3. History of the periodic table - Wikipedia

   en.wikipedia.org/wiki/History_of_the_periodic_table

   This is an accepted version of this page This is the latest accepted revision, reviewed on 17 November 2024. Development of the table of chemical elements The American chemist Glenn T. Seaborg —after whom the element seaborgium is named—standing in front of a periodic table, May 19, 1950 Part of a series on the Periodic table Periodic table forms 18-column 32-column Alternative and ...

4. List of chemical elements - Wikipedia

   en.wikipedia.org/wiki/List_of_chemical_elements

   The definitive visualisation of all 118 elements is the periodic table of the elements, whose history along the principles of the periodic law was one of the founding developments of modern chemistry.

5. Discovery of chemical elements - Wikipedia

   en.wikipedia.org/wiki/Discovery_of_chemical_elements

   Lavoisier writes the first modern list of chemical elements – containing 33 elements including light and heat but omitting Na, K (he was unsure of whether soda and potash without carbonic acid, i.e. Na 2 O and K 2 O, are simple substances or compounds like NH 3), [91] Sr, Te; some elements were listed in the table as unextracted "radicals ...

6. Period (periodic table) - Wikipedia

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

   In the periodic table of the elements, each numbered row is a period. A period on the periodic table is a row of chemical elements. All elements in a row have the same number of electron shells. Each next element in a period has one more proton and is less metallic than its predecessor.

7. Periodic trends - Wikipedia

   en.wikipedia.org/wiki/Periodic_trends

   The periodic trends in properties of elements. In chemistry, periodic trends are specific patterns present in the periodic table that illustrate different aspects of certain elements when grouped by period and/or group. They were discovered by the Russian chemist Dmitri Mendeleev in 1863.

8. Types of periodic tables - Wikipedia

   en.wikipedia.org/wiki/Types_of_periodic_tables

   Deming's periodic table of 1923 [40] A modern periodic table colour-coded to show some common or more commonly used names for sets of elements. The categories and their boundaries differ somewhat between sources. [ 41 ]

9. Moseley's law - Wikipedia

   en.wikipedia.org/wiki/Moseley's_law

   Moseley's periodic law, concerning the modern periodic table. Auger electron spectroscopy, a similar phenomenon with increased X-ray yield from species of higher atomic number. Discovery of the neutron Mosley's law was an important step in the development of the understanding of the atom.