why are tarcer elements important?
968528
Tracer elements are radioactive isotopes that can be used in a reaction and followed by geiger counter or other means to trace the reaction . \nThey are used to check for cracks in aircraft;\nThey are used to see where pipes are leaking.\nThey are used in the body to check on cancer.(iodine goes to the hot spots in the thyroid)\nThey can be used to check pathways in the body.\n\nA question? where does the O2 come from in the photosynthesis reaction, the H2O or the CO2?\n\nIf you tag one of the oxygens and then see where the tag is after the reaction, you can answer the question. Tag means to use a radioactive isotope.
593271
Osmium and Iridium are the two most dense elements in pure form. They are also very pretty metals, iridium particularly. Unlike osmium, iridium does not tarnish in air, and is in fact impervious to many forms of chemical attack, much like platinum. An alloy of 90% platinum and 10% iridium is widely used in both the jewelry and chemical industries, because it is strong, hard, beautiful, and impervious to almost all chemicals even at very high temperatures.\n\nWhich is the most dense element, osmium or iridium? That honor has changed hands a couple of times over the years.
748414
The conduction of food materials,water,etc is very essential for the survival of an organism.If u take the example of lower organism devoid of any specialized structures for conduction,the complexities of life processes are not as complex as that of the higher organisms.The specialized structures are more efficient,protective in their own ways and above all indispensable.If the complex life forms can carry out many processes at same time its because they get uninterrupted supply of oxygen,blood in case of higher animals,water and many materials at the same time .its all because of specialized structures.
1042758
Calcium is the chemical element in the periodic table that has the symbol Ca and atomic number 20. Calcium is a soft grey alkaline earth metal that is used as a reducing agent in the extraction of thorium, zirconium and uranium. Calcium is also the fifth most abundant element in the Earth's crust. It is essential for living organisms, particularly in cell physiology, and is the most common metal in many animals.\n\nIT MAKES YOUR BONES STRONGER - and prevents osteoporosis
764824
It has a stronger potential to cause cancer than cigs. More tar = carcinogens.
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check this site out\n\nhttp://www.chemicalelements.com/elements/al.html
79044
Here is a centralized page of information, with several links along the left side for more information:\nhttp://www.webelements.com/webelements/elements/text/Cu/key.html
219445
Carbon is in the same family as lead, and it is the only element in that group that is in a period lower than 2.  So carbon is the only element fitting your requirement.
210441
The amount of protons it has decides what element it will be. For compound things, it matters on what elements it is made up of and the structure of the lattice that bonds the atoms together.
258321
Your question is a little hazy.  Are you looking for titanium?  Many different "elements", as in the periodic table, are in an engine.
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Some of the elements while in gaseous state.
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You are looking for element #29 - Copper (Cu).
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copper is one of many "transiton metals" which means it is one of the elements in the middle-lower part of the periodic table - groups 3 to 12, also called the d-block because they have electrons that occupy d orbitals.  other transition metals include zinc, magnesium, mercury, iron, gold, silver - altogether there are 40 of them.\n\ncopper is shiny, red-orangish in color, and is a very good conductor of both heat and electricity.
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It's element 94 on the Periodic Table of Elements (see URL, below).  It's radioactive because nuclei of Plutonium atoms give off alpha and beta particles and gamma radiation in a process of radioactive decay.  The Wikipedia article on radioactive decay explains this well (URL below).
598430
Copper has a higher melting and boiling point and better electrical conductivity.\n\nIf you are a die caster, Zinc would be better because it can be easily pressure die-cast and hence better accuracy in the cast component with minimal metal removal for finishing.
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http://www.chemicalelements.com/elements/br.html
670044
in its metallic form is an essential component in the making of esters and in the manufacture of organic compounds. This alkali metal is also a component of sodium chloride (NaCl) which is vital to life. Other uses:\n\nIn certain alloys to improve their structure. \nIn soap, in combination with fatty acids. \nTo descale metal (make its surface smooth). \nTo purify molten metals. \nIn sodium vapor lamps, an efficient means of producing light from electricity. \nAs a heat transfer fluid in some types of nuclear reactors and inside the hollow valves of high-performance internal combustion engines.