Fluorine = 9
Chlorine = 17
Bromine = 35
Iodine = 53
Astatine = 85
The halogens are a group of elements in the periodic table that includes fluorine, chlorine, bromine, iodine, and astatine. They are located in Group 17, and their atomic numbers increase across the period from fluorine (atomic number 9) to astatine (atomic number 85). This means that each halogen element in this group has one more proton in its nucleus compared to the previous element, resulting in an increase in atomic number.
Atomic number= number of protons. Hydrogen atomic number=1
Halogens typically have an oxidation number of -1 in compounds because they have seven valence electrons and need to gain only one electron to achieve a full octet. Exception: in compounds with oxygen or other halogens, halogens may have positive oxidation numbers.
The oxidation numbers of halogens can vary because they have seven valence electrons, making it possible for them to gain or lose different numbers of electrons to attain a stable electron configuration. This flexibility allows halogens to exhibit a range of oxidation states in chemical compounds, such as -1, +1, +3, +5, +7.
Most common is -1. But halogens (except fluorine) are known to exhibit oxidation numbers upto +7 in their compounds.
The reactivity of halogens decreases with increasing atomic number.
The halogens are a group of elements in the periodic table that includes fluorine, chlorine, bromine, iodine, and astatine. They are located in Group 17, and their atomic numbers increase across the period from fluorine (atomic number 9) to astatine (atomic number 85). This means that each halogen element in this group has one more proton in its nucleus compared to the previous element, resulting in an increase in atomic number.
The halogens are located on the left of the noble gases on the periodic table. These five toxic, non-metallic elements make up Group 17 of the periodic table and consist of: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).
Halogens with lower atomic number are more reactive and less dense. Also iodine is solid, bromine liquid and the first halogens are gases.
blop
no, but lower halogens have different oxidation states.
Describe the reactivity of halogens
the reactivity of halogens goes on decreasing as we go down the group, because of increasing in atomic size of the respective element.
No element has this atomic number. All atomic numbers are whole numbers.
noble halogens
Fluorine, chlorine, bromine, iodine, astatine (ununseptium?)
Describe the reactivity of halogens