The s-block elements of the Periodic Table are those in which the last electron enters the outermost s-orbital. As the s-orbital can accommodate only two. Characteristic properties of s- block elements. • Metallic character. • Low electronegativity. • Basic oxides, hydroxides. • Ionic bond with fixed oxidation states. This is “Periodic Trends and the s-Block Elements”, chapter 21 from the book In Chapter 22 "The ", we consider the chemistry of the p-block elements;.
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Characteristic properties of the s-block elements. （1）Metallic character and low electronegativity. Group I Metal Symbol Atomic number. Electronic structure. Free PDF download of Class 11 Chemistry revision notes & short key-notes for Chapter 10 - The s-Block Elements to score high marks in exams, prepared by. CHEMISTRY 2 CHAPTER 3 BY NAVEED AHMED. S- BLOCK ELEMENTS: The elements of IA and IIA groups of the periodic table are referred to as "s-Block.
When BeO is heated with carbon at — K a brick red coloured carbide of the formula Be 2 C is formed. Beryllium carbide reacts with water to give methane whereas carbides of other alkaline earth metals gives acetylene gas.
Beryllium does not exhibit coordination number more than four as it has four orbitals in the valence shell. The other members of this group has coordination number. The hydroxides of Be, [Be OH 2 ] and aluminium [Al OH 3 ] are amphoteric in nature, whereas those of other elements of group — 2 are basic in nature.
The oxides of both Be and Al i. It occurs in nature as marble, limestone, chalk, coral, calcite, etc. It is prepared as a white powder, known as precipitated chalk, by dissolving marble or limestone in hydrochloric acid and removing iron and aluminium present by precipitating with NH 3 , and then adding ammonium carbonate to the solution; the precipitate is filtered, washed and dried.
It occurs in nature as gypsum and the anhydrous salt as anhydride. It is prepared by precipitating a solution of calcium chloride or nitrate with dilute sulphuric acid.
The effect of heat on gypsum or the dihydrate presents a review of interesting changes. On heating the monoclinic gypsum is first converted into orthorhombic form without loss of water. The addition of common salt accelerates the rate of setting, while a little borax or alum reduces it. The setting of plaster of paris is believed to be due to rehydration and its reconversion into gypsum.
It is used to make cement by mixing it with silica, alumina or clay. Slaked lime is used as a building material in form of mortar. It is prepared by mixing 3 — 4 times its weight of sand and by gradual addition of water. It is used in softening of hard water.
It is used as such as a fertilizer. Dear , Preparing for entrance exams? Register yourself for the free demo class from askiitians. Studying in Grade 6th to 12th? MOB20 View Course list. Course Features.
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Get Solution now! Chapter 1 - Some Basic Concepts of Chemistry. Chapter 2 - Structure of Atom.
Chapter 3 - Classification of Elements and Periodicity in Properties. Chapter 4 - Chemical Bonding and Molecular Structure. Chapter 5 - States of Matter.
Chapter 6 - Thermodynamics. Chapter 7 - Equilibrium. Chapter 8 - Redox Reactions. Chapter 11 - The p-Block Elements. Chapter 13 - Hydrocarbons. Class 11 Maths Revision Notes. Class 11 Physics Revision Notes. Register now.
The alkali metals are silvery white, soft and low melting. They are highly reactive. The compounds of alkali metals are predominantly ionic. Their oxides and hydroxides are soluble in water forming strong alkalies.
Important compounds of sodium include sodium carbonate, sodium chloride, sodium hydroxide and sodium hydrogen carbonate. Sodium hydroxide is manufactured by using Castner-Kellner process and sodium carbonate by Solvay process. The chemistry of alkaline earth metals is very much like that of the alkali metals. However, some differences arise because of reduced atomic and ionic sizes and increased cationic charges in case of alkaline earth metals. Their oxides and hydroxides are less basic than the alkali metal oxides and hydroxides.
Industrially important compounds of calcium include calcium oxide lime , calcium hydroxide slaked lime , calcium sulphate Plaster of Paris , calcium carbonate limestone and cement.
Portland cement is an important constructional material. It is manufactured by heating a pulverised mixture of limestone and clay in a rotary kiln. All these substances find variety of uses in different areas. The s-Block Elements class 11 Notes Chemistry.
CBSE quick revision note for class Chemistry, Physics, Maths, Biology and other subject are very helpful to revise the whole syllabus during exam days. The revision notes covers all important formulas and concepts given in the chapter.
Even if you wish to have an overview of a chapter, quick revision notes are here to do if for you. These notes will certainly save your time during stressful exam days. Save my name, email, and website in this browser for the next time I comment. Group 1 Elements: Alkali Metals Physical properties of alkali metals Large atomic radii: The atomic radii of alkali metals increases down the group.
They have largest atomic radii in their respective period.
Large ionic radii: The ionic radii increase as we go down the group. Low ionization enthalpy: The ionization enthalpies of the alkali metals are the lowest due to loosely held s-electron. Hydration enthalpy: