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element |
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element /el·e·ment/ (el´ĕ-ment) 1. any of the primary parts or constituents of a thing. 2. in chemistry, a simple substance that cannot be decomposed by chemical means and that is made up of atoms which are alike in their peripheral electronic configurations and so in their chemical properties and also in the number of protons in their nuclei, but which may differ in the number of neutrons in their nuclei and so in their mass number and in their radioactive properties. 3. in the philosophies underlying some complementary medicine systems, a member of a group of basic substances that give rise to everything that exists. five elements 1. see under phase. 2. in ayurvedic tradition, the basic entities (earth, air, fire, water, and space) whose interaction gives rise to material existence. formed elements of the blood the blood cells. trace elements chemical elements distributed throughout the tissues in very small amounts and that are either essential in nutrition, as cobalt, copper, etc., or harmful, as selenium. transposable element see transposon.
element Etymology: L, elementum, first principle one of more than 100 primary, simple substances that cannot be broken down by chemical means into any other substance. Each atom of any element contains a specific number of protons in the nucleus and an equal number of electrons outside the nucleus. In most elements, the nucleus may contain a variable number (high or low) of neutrons. An element with a disproportionate number of neutrons may be unstable, in which case the nucleus undergoes radioactive decay into a more stable element. See also atom, compound, molecule, radioactivity. element, n any substance that cannot be reduced into a less complex substance, all atoms of which are defined as having the same number of protons. element, n a simple substance that cannot be decomposed by chemical means and is made up of atoms that are alike in their peripheral electronic configuration and chemical properties but differ in their nuclei, atomic weights, and radioactive properties. element 1. any of the primary parts or constituents of a thing. 2. in chemistry, a simple substance that cannot be decomposed by ordinary chemical means; the basic 'stuff' of which all matter is composed. Chemical elements are made up of atoms. Each atom consists of a nucleus with a cloud of negatively charged particles (electrons) revolving around it. The two major components of the nucleus are protons and neutrons. The number of protons in the atoms of a particular element is always the same, and therefore the physical and chemical properties of the element are always the same. It is possible, however, for a chemical element to exist in several different forms, the difference depending on the number of neutrons in the nucleus of its atoms. Different forms of the same element are called isotopes. There are at least 105 different chemical elements known. Table 6 lists the elements, and the symbol, atomic weight and atomic number of each. The atomic number of an element is determined by the number of protons in the nucleus of an atom of the element. The mass number of an isotope is determined by the total number of neutrons and protons in the nucleus. formed e's (of the blood) erythrocytes, leukocytes and platelets. element points see horary points. trace element a chemical element present or needed in extremely small amount by plants and animals, such as manganese, copper, cobalt, zinc, iron. See also trace element. Patient discussion about element 110. Q. what consider to be a good nutrition for children? does it has to include some specific nutrition elements? A. there's many things you should consider about children's nutrition, the amount of books written about kids nutrition can fill a library... Read more or ask a question about element 110vitamins, organic vs industrial, fast food vs home made etc. here are 2 video libraries that i'm sure you'll find all the info you seek in them- http://www.thedoctorsvideos.com/categories/26/Nutrition http://www.drmdk.com/html/nutrition.html How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| It decayed after less than a millisecond by emitting an alpha particle, which consists of two protons and two neutrons, to create an iso tope of element 110 with an atomic mass of 273. The discovery of element 111 caps a remarkable season for the Darmstadt lab, which in November found element 110 (SN: 11/26/94, p. That intermediate atom then ejected a neutron, stabilizing itself for 270 microseconds as the long-sought element 110 before undergoing a unique chain of decays. |
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