![]() ![]() ![]() Halogens are usually coloured due to the absorption of radiation in their visible regions. With change in atomic number, the melting and the boiling points of the elements change. Chlorine and fluorine are glasses naturally, bromine is liquid in its natural state and iodine is solid in nature. Halogens exhibit smooth transitions in their Physical state. The Physical and Chemical properties of Halogens are greatly similar which is not observed in other groups. Out of the five Halogens, Astatine is the only radioactive element. They are highly electronegative in nature as they are only one electron short of the nearest noble gas configuration. They have seven electrons in their outermost shell with the electronic configuration ns 2 np 5. Halogens are highly reactive nonmetals belonging to the 17th group of the periodic table. In this article, students will learn about Halogens and their properties. The last element of the group, Astatine, is radioactive in nature. ![]() Electronegativity is defined as the ability of an atom to accept an electron and form an octet. Halogens exhibit high electronegativity and the anions formed become the anionic part of the salts which are widely found in seawater. The word “Halogen” is a Greek word which means salt producer due to the properties of elements like Bromine, Chlorine and Iodine. There are five Halogens and in order of valency in the periodic table they are as follows: Chlorine, Fluorine, Iodine, Bromine and Astatine. They come under the p-block elements of the modern periodic table. Group 17 elements of the periodic table comprises Halogens. ![]()
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