What group is halogens in the periodic table?
Group 17
halogen, any of the six nonmetallic elements that constitute Group 17 (Group VIIa) of the periodic table. The halogen elements are fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At), and tennessine (Ts).
Why 7 a group are called halogens?
Halogen means ‘salt-forming compounds’. Group 7 elements when they react with metal forms salt, hence the name halogen.
Why are group 13 elements called halogens?
They are called “halogens” because they give salts when they react with metals. The valence shell electronic configuration of these electrons is ns2np5. The nuclear and atomic radii of these elements keep on increasing as we move down the group. These elements have higher ionization enthalpy.
Who discovered halogens?
Baron Jöns Jacob Berzelius
However, in 1826, the Swedish chemist Baron Jöns Jacob Berzelius proposed the term “halogen” for the elements fluorine, chlorine, and iodine, which produce a sea-salt-like substance when they form a compound with an alkaline metal.
What does the name halogen mean?
halogennoun. Any element of group 7, i.e. fluorine, chlorine, bromine, iodine and astatine, which form a salt by direct union with a metal. Etymology: From ἅλς + -gen, referring to elements which produce a salt in union with a metal.
What are characteristics of halogens?
In general, halogens have low melting and boiling points, high electronegativities, and are sparingly soluble in water. Their properties show trends as you move down the group. For example, atomic radius and melting and boiling points increase down the group whilst reactivity and electronegativity decrease.
What are 5 properties of the halogens group?
Halogens share many similar properties including:
- They all form acids when combined with hydrogen.
- They are all fairly toxic.
- They readily combine with metals to form salts.
- They have seven valence electrons in their outer shell.
- They are highly reactive and electronegative.