Boron, aluminium, gallium ,indium ,thallium
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.
The third row of the periodic table contains elements with 3p electrons. Some examples of elements in this row are phosphorus, sulfur, and chlorine.
Now (January 2012) the periodic table of Mendeleev contain 118 chemical elements.
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.
Argon is in the third period of the modern periodic table.
Europium
Tantalum
There are eight third period transition elements on the periodic table.
Silicon (Si) is situated between Aluminium (Al) and Phosphorus (P) in the Periodic Table. Its atomic number is 14, and it belongs to the "metalloids" category of the Table. Its period number is 3 and its group number is 14.
Neptunium is element 93.
Argon (Ar, element number 18) is the last element in the third period of the periodic table.
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 third row of the periodic table contains elements with 3p electrons. Some examples of elements in this row are phosphorus, sulfur, and chlorine.