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A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z). [ 1 ] The definitive visualisation of all 118 elements is the periodic table of the elements , whose history along the principles of the periodic law was one of the founding ...
Of the group 9 elements, only cobalt has a biological role. It is a key constituent of cobalamin , also known as vitamin B 12 , the primary biological reservoir of cobalt as an ultratrace element . [ 21 ] [ 22 ] Bacteria in the stomachs of ruminant animals convert cobalt salts into vitamin B 12 , a compound which can only be produced by ...
Fluorine is a chemical element; it has symbol F and atomic number 9. It is the lightest halogen [ note 1 ] and exists at standard conditions as pale yellow diatomic gas. Fluorine is extremely reactive as it reacts with all other elements except for the light inert gases .
Elements in the same group tend to show similar chemical characteristics. Vertical, horizontal and diagonal trends characterize the periodic table. Metallic character increases going down a group and from right to left across a period. Nonmetallic character increases going from the bottom left of the periodic table to the top right.
Post-transition metals (8 C, 9 P) R. Rare earth elements (3 C, 3 P) T. ... Pages in category "Metallic elements" The following 4 pages are in this category, out of 4 ...
Theodore Gray (2009), The Elements: A Visual Exploration of Every Known Atom in the Universe, Black Dog & Leventhal Publishers, Inc. Sam Kean (2011), The Disappearing Spoon and Other True Tales of Madness, Love, and the History of the World From the Periodic Table of the Elements, Back Bay Books/Little Brown and Company
A chemical element is a substance that cannot be divided or changed into different substances by ordinary chemical methods. The smallest particle of such an element is an atom , which consists of electrons centered around a nucleus of protons and neutrons .
Germanium cluster anions (Zintl ions) such as Ge 4 2−, Ge 9 4−, Ge 9 2−, [(Ge 9) 2] 6− have been prepared by the extraction from alloys containing alkali metals and germanium in liquid ammonia in the presence of ethylenediamine or a cryptand. [42] [44] The oxidation states of the element in these ions are not integers—similar to the ...