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2. 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.

3. Alkali metal - Wikipedia

   en.wikipedia.org/wiki/Alkali_metal

   [26] [27] His version put all the alkali metals then known (lithium to caesium), as well as copper, silver, and thallium (which show the +1 oxidation state characteristic of the alkali metals), together into a group. His table placed hydrogen with the halogens. [21] Dmitri Mendeleev's periodic system proposed in 1871 showing hydrogen and the ...

4. Boron group - Wikipedia

   en.wikipedia.org/wiki/Boron_group

   The boron group are the chemical elements in group 13 of the periodic table, consisting of boron (B), aluminium (Al), gallium (Ga), indium (In), thallium (Tl) and nihonium (Nh). This group lies in the p-block of the periodic table. The elements in the boron group are characterized by having three valence electrons. [1]

5. Periodic table - Wikipedia

   en.wikipedia.org/wiki/Periodic_table

   Periodic table of the chemical elements showing the most or more commonly named sets of elements (in periodic tables), and a traditional dividing line between metals and nonmetals. The f-block actually fits between groups 2 and 3 ; it is usually shown at the foot of the table to save horizontal space.

6. 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. ... Alkali metals (7 C, 14 P) Alkaline earth metals (7 C, 12 P) C.

7. List of chemical elements - Wikipedia

   en.wikipedia.org/wiki/List_of_chemical_elements

   Dmitri Mendeleev, Russian chemist who proposed the periodic table: f-block groups 7 f-block [258] (10.3) (1100) – – 1.3 – synthetic unknown phase 102 No Nobelium: Alfred Nobel, Swedish chemist and engineer f-block groups 7 f-block [259] (9.9) (1100) – – 1.3 – synthetic unknown phase 103 Lr Lawrencium: Ernest Lawrence, American ...

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

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

   a Group 1 is composed of hydrogen (H) and the alkali metals. Elements of the group have one s-electron in the outer electron shell. Hydrogen is not considered to be an alkali metal as it is not a metal, though it is more analogous to them than any other group. This makes the group somewhat exceptional.

9. Main-group element - Wikipedia

   en.wikipedia.org/wiki/Main-group_element

   In chemistry and atomic physics, the main group is the group of elements (sometimes called the representative elements) whose lightest members are represented by helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, and fluorine as arranged in the periodic table of the elements. The main group includes the elements (except hydrogen ...