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2. Periodic table - Wikipedia

   en.wikipedia.org/wiki/Periodic_table

   The periodic table, also known as the periodic table of the elements, is an ordered arrangement of the chemical elements into rows ("periods") and columns ("groups"). It is an icon of chemistry and is widely used in physics and other sciences.

3. Template:Periodic table (group names) - Wikipedia

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

   See also Group 3 element#Composition. d Group 18, the noble gases, were not discovered at the time of Mendeleev's original table. Later (1902), Mendeleev accepted the evidence for their existence, and they could be placed in a new "group 0", consistently and without breaking the periodic table principle. r Group name as recommended by IUPAC.

4. 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.

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. ... Group 1 element; Group 2 element; Group 3 element; Group 4 element;

6. File:Periodic table detailed v1.svg - Wikipedia

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

   Groups with common names are labeled as such. Radioactive elements are indicated with one of two different radioactivity symbols depending the half-life of their most stable isotope. The two symbols were defined by a half-life of more or less than 150 years for purely stylistic reasons. The overall design is heavily inspired by that of Robert ...

7. File:The Periodic Table of the Elements in Pictures.pdf

   en.wikipedia.org/wiki/File:The_Periodic_Table_of...

   English: This pictorial periodic table is colorful, boring, and packed with information. In addition to the element's name, symbol, and atomic number, each element box has a drawing of one of the element's main human uses or natural occurrences. The table is color-coded to show the chemical groupings.

8. Main-group element - Wikipedia

   en.wikipedia.org/wiki/Main-group_element

   The periodic table of the chemical elements.The columns represent the groups.Groups 1, 2 and 13 to 18 constitute the main group. Sometimes groups 3 and 12, as well as the lanthanides and actinides (the two rows at the bottom), are also included in the main group.

9. List of chemical elements - Wikipedia

   en.wikipedia.org/wiki/List_of_chemical_elements

   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). [ 1 ] 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 ...