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2. Halogen - Wikipedia

   en.wikipedia.org/wiki/Halogen

   The group of halogens is the only periodic table group that contains elements in three of the main states of matter at standard temperature and pressure, though not far above room temperature the same becomes true of groups 1 and 15, assuming white phosphorus is taken as the standard state. [n 1] All of the halogens form acids when bonded to ...

3. Group (periodic table) - Wikipedia

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

   In the periodic table of the elements, each column is a group. In chemistry, a group (also known as a family) [1] is a column of elements in the periodic table of the chemical elements. There are 18 numbered groups in the periodic table; the 14 f-block columns, between groups 2 and 3, are not numbered.

4. Names for sets of chemical elements - Wikipedia

   en.wikipedia.org/wiki/Names_for_sets_of_chemical...

   These sets usually do not aim to cover the whole periodic table (as for example period does), and often overlap or have boundaries that differ between authors. Some examples: Metals and nonmetals; Metalloids – Variously-defined group of elements with properties intermediate between metals and nonmetals. In alphabetic order:

5. Category:Groups (periodic table) - Wikipedia

   en.wikipedia.org/wiki/Category:Groups_(periodic...

   In the periodic table, a group is defined as a column. A single group can have multiple names. Subcategories. ... Halogens (8 C, 12 P) N. Noble gases (8 C, 14 P) P.

6. Periodic table - Wikipedia

   en.wikipedia.org/wiki/Periodic_table

   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. In nature, only elements up to atomic number 94 exist; [a] to go further, it was necessary to synthesize new elements in the laboratory.

7. Help : Periodic table classifications in the English Wikipedia

   en.wikipedia.org/wiki/Help:Periodic_table...

   Groups (columns in the periodic table; sometimes called 'family') are numbered 1–18, following modern IUPAC guidelines. So called trivial group names, like halogens, are well defined and acceptable. Each group can also be identified by its top element: group 14 = carbon group.

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9. 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.