Astatine is the 6th period halogen.
bromine
Fluorine
It is bromine. Edit: NO. It is NOT bromine. The third period halogen is chlorine (Cl). Bromine happens to be in period 4.
Bromine. :)
Nitrogen is not a halogen; nitrogen is a pnictide, group 15 and period 2 in the periodic table of Mendeleev.
chlorine
Iodine
Fluorine
bromine
It is bromine. Edit: NO. It is NOT bromine. The third period halogen is chlorine (Cl). Bromine happens to be in period 4.
Iodine, element number 53 is the halogen (Group 17) element in period 5.
This chemical element is astatine (At).
Bromine. :)
Chlorine, the halogen in period 3.
Nitrogen is not a halogen; nitrogen is a pnictide, group 15 and period 2 in the periodic table of Mendeleev.
1s2s2p3s3p4s4p5s5p6s6p
chlorine