Boron, aluminium, gallium ,indium ,thallium
Now (January 2012) the periodic table of Mendeleev contain 118 chemical elements.
Iodine
Tantalum
There are eight third period transition elements on the periodic table.
Argon (Ar, element number 18) is the last element in the third period of the periodic table.
There are 8 elements in the third period of periodic table. The elements belong to group-1,2,13,14,15,16,17 and 18
Scandium and Yttrium
The elements in column 18 of a wide form periodic table or Column VIII of a narrow form periodic table, commonly called the noble gases. Also, both elements in the first period, the elements in groups 15, 16, and 17 of the second period, and the element in group 17 of the third period.
Now (January 2012) the periodic table of Mendeleev contain 118 chemical elements.
Tantalum
Iodine
Europium
expanded
There are eight third period transition elements on the periodic table.
Neptunium is element 93.
Group 3 on the periodic table is also known as the Scandium family. It contains known elements such as Scandium and Yttrium and the Lanthanides and Actinides are also associated with this group, although not full members!
The rows going across the periodic table are called periods. As you go across a row, each element increases in number of protons and electrons, which distinguishes it from other elements in the table.