Name the following along with their symbole.
(i) Alkali metal present in fourth
(ii) Halogen present in fourth period
(iii) Inert gas present in third period
Name the following along with their symbole.
(i) Alkali metal present in fourth
(ii) Halogen present in fourth period
(iii) Inert gas present in third period
Classification of elements
The modern periodic table classifies elements into different groups and periods based on the electronic configuration and properties. They are classified into groups and periods and the elements in the same group have similar properties.
(a) Alkali metals belong to the first group in the periodic table. The elements in this group are Hydrogen (H), Lithium (Li), Sodium (Na), Potassium (K), rubidium (Rb), Cesium (Cs), Francium (Fr). Alkali metals are present from first to seventh period in the periodic table. Therefore, alkali metal in the fourth period is Potassium with the symbol K.
(b) Halogens belong to the seventeenth group in the periodic table. The elements in this group are Fluorine (F), Chlorine (Cl), Bromine (Br), Iodine (I) and Astatine (At). Halogens are present from second to sixth period in the periodic table. Therefore, the halogen in the fourth period is Bromine with the symbol Br.
(c) Inert gases are elements in the eighteenth group. The elements in this group include Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr),Xenon (Xe) and Radon (Rn). They are present from the first to sixth periods. Therefore, the inert gas in the third period is Argon (Ar).
Classification of elements
The modern periodic table classifies elements into different groups and periods based on the electronic configuration and properties. They are classified into groups and periods and the elements in the same group have similar properties.
(a) Alkali metals belong to the first group in the periodic table. The elements in this group are Hydrogen (H), Lithium (Li), Sodium (Na), Potassium (K), rubidium (Rb), Cesium (Cs), Francium (Fr). Alkali metals are present from first to seventh period in the periodic table. Therefore, alkali metal in the fourth period is Potassium with the symbol K.
(b) Halogens belong to the seventeenth group in the periodic table. The elements in this group are Fluorine (F), Chlorine (Cl), Bromine (Br), Iodine (I) and Astatine (At). Halogens are present from second to sixth period in the periodic table. Therefore, the halogen in the fourth period is Bromine with the symbol Br.
(c) Inert gases are elements in the eighteenth group. The elements in this group include Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr),Xenon (Xe) and Radon (Rn). They are present from the first to sixth periods. Therefore, the inert gas in the third period is Argon (Ar).
