Element - definition of element by The Free Dictionary
any group of people singled out, often with disapproval, as having identifiable behavior patterns, common goals, ethnic similarities, etc.: the radical element. (Astronomy) astronomy any of the numerical quantities, such as the major axis or eccentricity, used in describing the orbit of a planet, satellite, etc19
Aluminium was first isolated by Hans Christian Oersted in 1825 who reacted aluminium chloride (AlCl3) with potassium amalgam (an alloy of potassium and mercury). until 1925, at which time the American Chemical Society decided to revert back to aluminum, and to this day Americans still refer to aluminium as "aluminum"
elements.wlonk.com
This chart shows all the fundamental atomic electron orbitals as electron probability density distributions (fuzzy clouds), which is close as you can get to visualizing what an atom really looks like. In addition to the element's name, symbol, and atomic number, each element box has a drawing of one of the element's main human uses or natural occurrences
Like all metals, alkali metals are shiny, malleable, ductile and good conductors of heat and electricity, but alkali metals are softer than most other metals
Chemistry Resources at BPC: History of the Development of the Periodic Table of Elements
Precursors to the Periodic Table In 1862, A.E.Beguyer de Chancourtois was the first person to make use of atomic weights to reveal that the elements were arranged according to their atomic weights with similar elements occurring at regular intervals. A list of elements was wrapped around a cylinder so that several sets of similar elements lined up, creating the first geometric representation of the periodic law In 1863, John Newlands, an English chemist, proposed the Law of Octaves which stated that elements repeated their chemical properties every eighth element
Periodic Table of Elements and Chemistry
Just as Adams and Le Verrier could be said to have discovered the planet Neptune on paper, Mendeleev could be said to have discovered germanium on paper. This quantity can only be the charge on the central positive nucleus, of the existence of which we already have definite proof." Henry Moseley, Philosophical Magazine, Vol
Element 1: Hydrogen Element 2: Helium Element 3: Lithium Element 4: Beryllium Element 5: Boron Element 6: Carbon Element 7: Nitrogen Element 8: Oxygen Element 9: Fluorine Element 10: Neon Element 11: Sodium Element 12: Magnesium Element 13: Aluminum Element 14: Silicon Element 15: Phosphorus Element 16: Sulfur Element 17: Chlorine Element 18: Argon As we move past the first eighteen elements, you can start to learn about transition elements in the fourth period (row) of the periodic table
WebElements Periodic Table of the Elements
The evolution of chemistry's periodic table into the current form is an astonishing achievement with major contributions from many famous chemists and other eminent scientists
The Photographic Periodic Table of the Elements
Newest samples 2 September, 2013 What you'll find on this site My Popular Science Column Buy Posters, Card Decks and Books! Don't miss the mostBeautiful periodic tableposters and card decks plusreal elements and displaysfrom the creators of this site
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