enow.com Web Search

Search results

1. Results from the WOW.Com Content Network

2. Group (periodic table) - Wikipedia

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

   There are 18 numbered groups in the periodic table; the 14 f-block columns, between groups 2 and 3, are not numbered. The elements in a group have similar physical or chemical characteristics of the outermost electron shells of their atoms (i.e., the same core charge ), because most chemical properties are dominated by the orbital location of ...

3. 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.

4. List of chemical elements - Wikipedia

   en.wikipedia.org/wiki/List_of_chemical_elements

   The definitive visualization of all 118 elements is the periodic table of the elements, ... f-block groups 6 f-block: 138.91: 6.162: 1193: 3737: 0.195: 1.1: 39 ...

5. 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.

6. Core electron - Wikipedia

   en.wikipedia.org/wiki/Core_electron

   Therefore, unlike valence electrons, core electrons play a secondary role in chemical bonding and reactions by screening the positive charge of the atomic nucleus from the valence electrons. [2] The number of valence electrons of an element can be determined by the periodic table group of the element (see valence electron):

7. Group 8 element - Wikipedia

   en.wikipedia.org/wiki/Group_8_element

   Group 8 is a group (column) of chemical elements in the periodic table. It consists of iron (Fe), ruthenium (Ru), osmium (Os) and hassium (Hs). [1] "Group 8" is the modern standard designation for this group, adopted by the IUPAC in 1990. [1] It should not be confused with "group VIIIA" in the CAS system, which is group 18 (current IUPAC), the ...

8. Electron affinity - Wikipedia

   en.wikipedia.org/wiki/Electron_affinity

   E ea generally increases across a period (row) in the periodic table prior to reaching group 18. This is caused by the filling of the valence shell of the atom; a group 17 atom releases more energy than a group 1 atom on gaining an electron because it obtains a filled valence shell and therefore is more stable. In group 18, the valence shell is ...

9. Group 5 element - Wikipedia

   en.wikipedia.org/wiki/Group_5_element

   Group 5 is a group of elements in the periodic table. Group 5 contains ... are described by the predominance diagram, ... size and charge to phosphorus(V), vanadium(V ...