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.
chlorine
It is bromine. Edit: NO. It is NOT bromine. The third period halogen is chlorine (Cl). Bromine happens to be in period 4.
Astatine is the 6th period halogen.
Chlorine is the halofen present in the third periodg
Bromine (Br2) is the third most reactive halogen.
Iodine
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.
bromine
Fluorine
Iodine, element number 53 is the halogen (Group 17) element in period 5.
This chemical element is astatine (At).
Bromine. :)