8 - Na, Mg, Al, Si, P, S, Cl, Ar
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
Eight. Sodium, Magnesium, Aluminium, Silicon, Phosphorous, Sulfur, Chlorine, Argon
There are eight third period transition elements on the periodic table.
There are 2 elements in the first period, 8, 8 elements in 2nd and 3rd periods respectively,
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.
A period is a horizontal row on the periodic table of the elements. There are seven periods on the periodic table. Each period corresponds to the highest energy level that contains electrons. For example, the elements in the first period have electrons in the first energy level, which is the only energy level available; the elements in the second period have their highest energy electrons in the second energy level; the elements in the third period have their highest energy electrons in the third energy level, and so on.
If you have a periodic table of the elements available, look at the second column from the right. Those elements are often referred to as "halogens". The "rows" in the periodic table are often referred to as the "periods". So the halogen from the third period would be "CL", or chlorine. Glad to help with your homework.
Argon is in the third period of the modern periodic table.
Including S such elements are 8, Na,Mg,Al,SI,P,S,Cl and Ar. (3rd period of periodic table)
H and He are in the first period. Li Be, B, C, N, O, F, Ne are in the second and so on. A period is one row across on the periodic table
Now (January 2012) the periodic table of Mendeleev contain 118 chemical elements.
8 elements