Question

Fluorine, chlorine and bromine belong to the same group. What is common between them ?

Answer 1

Hint: The halogens are a set of five chemically related elements in the periodic table: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (A) (At). Tennessine (Ts), an artificially produced element, may also be a halogen. This group is designated as group 17 in contemporary IUPAC nomenclature.

Complete answer:
The word "halogen" literally means "salt-producing." When halogens react with metals, a variety of salts are produced, including calcium fluoride, sodium chloride (table salt), silver bromide, and potassium iodide. In chemistry, an element's valence or valency is a measure of its ability to combine with other atoms to create chemical compounds or molecules. The amount of hydrogen atoms that an atom of a certain element may combine with determines its combining capability, or affinity. Carbon has a valence of 4 in methane; nitrogen has a valence of 3 in ammonia; oxygen has a valence of 2 in water; and chlorine has a valence of 1 in hydrogen chloride. Because chlorine has a valence of one, it may be used to replace hydrogen. A valence electron is an outer shell electron connected with an atom that can participate in the creation of a chemical bond if the outer shell is not closed; in a single covalent connection, both atoms contribute one valence electron to create a shared pair in chemistry and physics. Fluorine, chlorine, and bromine all have the same amount of valence electrons and the same valency.

Note:
A valence electron may receive or release energy in the form of a photon, much like a core electron. Atomic excitation occurs when an energy gain causes an electron to migrate (jump) to an outer shell. Alternatively, the electron can break free from its linked atom's shell, resulting in ionisation and the formation of a positive ion. When an electron loses energy (and so emits a photon), it might migrate to an inner shell that isn't completely occupied.