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Score more in Chemistry with Video Lessons, Sample Papers, Revision Notes & more for Class-XI-Science - CBSESign up now. N-methyl propanamine and N-ethyl ethanamine  are examples of chain isomerism since the side chain in both compounds are different. Atomic Radius- half the distance between nuclei of identical atoms that are chemically bonded together. Ionic Radius- is a measure of the size of an ion in a crystal lattice trends within periods-- the size of the positive ions gradually decrease from left to right. Electronegativity- indicates relative ability of its atoms to attract electrons in a chemical bond. S- Block Elements The s-block metals vary from extremely soft (all the alkali metals) to quite hard (beryllium).
Little is known about the elements 113-118 (Ununtrium, Ununquadium, Ununpentium, Ununhexium, and Ununoctium). Periodic TableOur periodic table of chemical elements presents complete information on the chemical elements including the chemical element symbol, atomic number, atomic weight and description.
The Periodic Table displays all known chemical elements which are grouped by chemical properties and atomic structure. Copper, silver, gold, mercury, tin, lead, and other elements have been known since ancient times and were used to make jewelry, coins, and tools.
It was only in 1869 when Dmitri Mendeleev, an inventor and chemist of Russian origin, discovered the Periodic Law and organized all chemical elements in columns and rows. The Periodic Table includes 18 groups, and each group contains elements with similar chemical and physical properties of the outermost electron shells. Group 1 of the Periodic Table groups together the alkali metals while group 2 contains all alkaline earth metals. The major categories are metalloids, nonmetals, and metals, and most elements in the Periodic Table are metals.
The rarest element is astatine, and scientists estimate that the total amount found is less than 1 gram.
The group of precious metals includes elements such as palladium, ruthenium, platinum, iridium, and gold.
About 75 percent of the mass of the universe consists of hydrogen, making it the most abundant element.

Polonium, which is classified as a metal and metalloid, is the most radioactive element that has no stable isotopes.
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The periodic table classifies elements and helps us to understand the properties and reactions of the elements. Antoine Lavoiser--- compiled a list of 23 elements (the ones known at that time- late 1790s). With the exception of beryllium and magnesium, the metals are too reactive for any structural use except as very minor components of alloys with lead.
Its symbol is He and it is the second element.Helium was found on the sun before it ws found on the Earht. The Transition Metals These elements share properties such as electrical conductivity, luster, and malleability with other metals. Alloys of scandium and aluminum are used in some kinds of athletic equipment Titanium (Ti)- # 22. Manganese is added to molten steel to remove oxygen and sulfur and is alloyed with steel to make it easier to form and work with and to increase steel's strength and resistance to impact. Period 1 contains two elements, helium and hydrogen while period 7 contains radioactive elements. Metals are malleable, shiny, and ductile while nonmetals lack metallic properties and are volatile.
Hydrogen has important commercial applications, for example, hydrogen fuel cells and the manufacture of chemical products.
Other elements with high density include platinum, rhenium, gold, thallium, berkelium, and americium. The p-block contains all of the nonmetals (except for Hydrogen and Helium which are in the s-block) and semimetals, as well as some of the metals. Since titanium does not react within the human body, it is used to create artificial hips, pins for setting bones and for other biological implants. Our periodic table information can be useful for chemistry and physics students, as well as science researchers.You can test your Periodic Table knowledge with our Periodic Table Quiz. Johan Dobereiner grouped chemical elements into triads, and De Chancourtois formulated a chart with closely related elements.

Attempts were made to synthesize several new elements, including unbiseptium, unbihexium, unbiquadium, and unbibium.
The Periodic Table groups elements into the cobalt, chromium, vanadium, scandium, copper, cobalt, and other groups.
The f block includes inner transition elements and the d block is made of transition elements. The list of radioactive elements includes berkelium, radon, polonium, californium, thorium, and others.
If you are wondering what does have chemistry to do with money then read The Chemistry of Paper Money, The Chemistry of Polymer Banknotes and The Chemistry of Credit Cards. Although cobalt is used in electroplating to give objects an attractive surface that resists oxidation, it is more widely used to form alloys. The p block includes post-transition metals, semimetals, and nonmetals, with the exception of helium and hydrogen. This calculator displays all the information of the element entered.Below is given a default chemical element as "Hydrogen", you can just see how the calculator is showing it's properties. Vanadium is corrosion resistant and is sometimes used to make special tubes and pipes for the chemical industry. Arsenic (As)- number 33.used to make rat poison and some insecticides Antimony (Sb)- number 51.
Liquid oxygen, when combined with liquid hydrogen, makes an excellent rocket fuel Selenium (Se)- number 34.
Silver bromide, a chemical used in photography, now accounts for the largest use of bromine.
Its use as a potential diagnostic aid for various cancer has also been explored, but this application has been deemed impractical. Thallium sulfate, an odorless, tasteless thallium compound, was once used as a rat and ant poison.

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