INORGANIC CHEMISTRY – CLASS XI (ISC) Properties of Group 1 elements [Alkali metals] 1. Due to high reactivity‚ alkali metals do not occur free in nature. Elements of group 1 (or IA) are known as alkali metals because their hydroxides are soluble in water and form strongly alkaline solutions. Alkali metals are stored under kerosene oil because they get tarnished on exposure to air. 2. The general electron configuration of alkali metals is ns1. 3. Alkali metals have largest size and lowest
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Our planet Earth is unique in the solar system because as far as we know‚ life can exist only on Earth. Since life evolved‚ many processes have been taking place. Many elements have been present on Earth. Mankind has always had the thirst to find out why and how things happen. Mankind started to learn and research new and new things and thus the way of living started to improve. Science is the study of things. There are many branches of Science like Nature Science‚ Physics‚ Biology‚ Botany and many
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Strontium- is named after Strontian a small town in Scotland Atomic number- 38 Symbol- Sr Mass- 87.62 Density- 2.63 g/cm3 Melting point- 7770C Boiling point- 13820C State at room temp- In room temperature strontium is an alkaline earth metal. Alkaline earth metals are silvery‚ shiny and relatively soft metals‚ they are fairly reactive and they all occur in nature‚ but are only found in Compounds and minerals‚ not in their elemental forms. Solid strength- in a room temperature environment strontium
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Element name-Helium Element Symbol-He Atomic number-2 Group name or number- Part of the noble gases in group 18 Atomic mass (to nearest thousandth)-4.003 Number of protons-2 Number of neutrons-2 Number of electrons-2 Number of valence electrons-2 List of isotopes-He3 and He4 Electron Configuration-1s2 Discovered By-Pierre Janssen Year discovered-1868 Circumstances of discovery- Janssen discovered helium in 1868 when he was looking in a telescope when he found the yellow spectrum lines of helium
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Math Poems Sammy Square Sammy Square is my name My 4 sides are just the same Turn me around‚ I don’t care I’m always the same‚ I’m a square! Danny Diamond I am Danny Diamond I am like a kite But I’m really just a square Who’s corners are pulled tight Ricky Rectangle Ricky rectangle is my name My 4 sides are not the same 2 are short and 2 are long Count my sides‚ come along 1-2-3-4 Ollie Oval I am Ollie Oval A football shape is mine Some people think that I’m an egg But
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Paulina Milewska Kurt Jooss’ The Green Table Expressionism can be described as a movement in the fine arts that emphasized the expression of inner experience rather than realistic portrayal‚ looking to obtain not objective reality‚ but the subjective emotions and responses that objects and events arouse in the artist. Several characteristics of expressionism are distortion‚ exaggeration‚ primitivism‚ and fantasy. “The Green Table‚” a ballet by Kurt Jooss‚ 1932‚ is an ideal example of expressionism
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The 12 Tables of Roman law Analysis As advanced civilizations developed throughout the world‚ a common trend was observed regardless of time and location. That trend was the development of a law and government. Each civilization developed some form of law‚ the Babylonians had Hammurabi’s Code‚ the Hebrew had Mosaic Law‚ and the Greeks had the Draconian Law. Although these were all great forms of law‚ one of the most important advances in legal history was the Romans and their development of the
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The Teeter Hang Ups EP-560 inversion table is one of the excellent inversion tables. It grants a reliable back pain comfort for those who want further relaxation. With an accurate engineering‚ the Teeter inversion table is durable and trustworthy. It is designed with a manufacturer warranty along with a third-party safety certification. The Teeter EP-560 is available in two distinct versions – Ltd‚ and Sport. The Teeter Hang Ups EP-560 is fashioned to benefit its users to lead better lives in many
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HISTORY OF TABLE TENNIS Ping Pong Anyone? The sport got its start in England towards the end of the 19th century when‚ after dinner‚ some upper-middle class Victorians decided to turn their dining room tables into miniature versions of the traditional lawn tennis playing field. Several different every-day objects were employed in constructing the sport. They used a line of books as the net. Rackets were lids from empty cigar boxes‚ and a little later‚ parchment paper stretched around a frame. The
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Table Tennis History Like many other sports‚ Table Tennis began as a mild social diversion. It was probably played with improvised equipment in England‚ during the last quarter of the 19th century. Though Table Tennis evolved‚ along with Badminton and Lawn Tennis‚ from the ancient game of Tennis (also known as Jeu de Paume‚ Real tennis‚ Court Tennis or Royal Tennis)‚ the game was developed after Lawn Tennis became popular in the 1880s. Game manufacturers tried many experiments to market
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