Group VIIA elements are known as halogens and all have 7 valence electrons.
group 7 - halogens group 8 - noble gases
The combining ratio for Group II elements with Group VII elements is 1:2. For example, calcium (Group II) will combine with chlorine (Group VII) to form calcium chloride with a ratio of 1 calcium atom to 2 chlorine atoms.
Group VII and Group 8 ( the noble gases)
Group VII, the Nitrogen Family
Group VII A or XVII or Halogens.
Column VII A is an obsolete name; the official name of IUPAC is Group 17 (halogens group).
The elements in group VII of the periodic table are known as the halogens. This group includes fluorine, chlorine, bromine, iodine, and astatine. Halogens are highly reactive nonmetals that readily form salts with metals.
It is because they are halogens
Chlorine- Group VII- It has 7 valence electrons Group VII A- It does not lose electrons from its penultimate shell. Period 3- It has 17 electrons, therefore, electronic configuration is 2,8,7...3 shells
Bromine belongs to Halogens, vii A group of periodic table.
These obtained compounds are halides, ionic compounds.
Group I (alkali metals) and group VII (halogens) elements react together most vigorously. This is because alkali metals readily donate electrons to halogens, forming ionic compounds with high lattice energies. The reaction between sodium (group I) and chlorine (group VII) to form sodium chloride is a well-known example of this type of reaction.