Ununoctium was discovered (prepared) in 2006; old Mendeleev tables (printed before 2006) don't contain ununoctium.
Any practical use for ununoctium.
There are 118, but some tables still list only the most common, up to element 111, Rg (roentgenium)Scientists have discovered up to element 118, but four of the 118 have not been named except for their provisional designations (113 = ununtrium, 115 = ununpentium, 117 = ununseptium, 118= ununoctium).
Gadolinium is in the middle of the lanthanide sequence on the periodic table. (The lanthanide sequence is the skinny part at the bottom that, in some periodic tables, is put off to the side.)
118 elements are in the periodic table of elements; some of them are still unnamed (January 2013).
No. The noble gases are in group 18 in wide form periodic tables and group VIII in some older narrow form tables.
Almost all "seriously intended" periodic tables also include average Atomic Mass numbers. (Some periodic tables intended for primarily decorative use may not contain any numbers at all.)
The question is without sense because only some atoms of ununoctium were obtained up today.
15 (the 15th column from the left) or also called 5A on some periodic tables.
On some periodic tables metals have a different color.
element symbols, atomic number and atomic mass, or even color on some tables.
The periodic table contains all the chemical elements. Some periodic tables, depending on the version, includes additional information about each element, such as the melting points, boiling points, atomic masses, mass numbers, etc.
There is one standardized periodic table that is widely used in science and education. However, variations and alternative versions of the periodic table have been proposed over the years to highlight specific properties, trends, or categories of elements.