Why is Vanadium placed on the periodic table?
823131
Because it is an element.\n\nVanadium is probably one of those obscure metals that you don't learn much about in school. Basically, it is an element found as a part of several minerals. Now it's used in nuclear power plants and purification processes. You'll find it in the top row of transition metals just to the right of titanium. \n\nIt was discovered and named in 1901 by a scientist named del Rio in Mexico and later by another scientist named Sefstrom in Sweden. It was named after the Scandinavian goddess Vanadis. It wasn't until 1867 that pure vanadium was isolated. When purified, vanadium is a bright white metal. \n\nva·na·di·um  (v-nd-m)\nn. Symbol V\nA bright white, soft, ductile metallic element found in several minerals, notably vanadinite and carnotite, having good structural strength and used in rust-resistant high-speed tools, as a carbon stabilizer in some steels, as a titanium-steel bonding agent, and as a catalyst. Atomic number 23; atomic weight 50.942; melting point 1,890°C; boiling point 3,000°C; specific gravity 6.11; valence 2, 3, 4, 5. See Table at element.
1169808
The periodic table is organized by a few things, but most noticably is the amount of protons located in the nucleus of an atom.\n\n1 Hydrogen, 2 Helium, 3 Lithium, 4 Beryllium, 5 Boron etc\n\nYour question cannot be answered unless we found that there was a limit to the number of protons allowed to be in the nucleus.  As of right now, there is no pursuading evidence that there couldn't be an element with 603 protons, 2005 protons etc...\n\nSo we must admit that there could be an infinite amout of elements (though in the real world there isn't anything that is "Infinite") so theoretically we know 111 elements out of infinity. \nWhich is 0%.
888372
I don't really understand your question.  However, the higher up a metal is on the reactivity series the more reactive it is.  That means it likes making compounds with other things.  The less reactive a metal is the more likely you are to find it as an element in an uncombined form.\n\nThe earliest metals to be discovered were generally those that were uncombined in the ground or very easy to separate from the compounds they were found in.  So the least reactive metals were first to be discovered and used.\n\nThe most reactive metals were not discovered for thousands more years because they are only found in compounds, never as the metals themselves and are very difficult to extract from their ores.  Electrolysis has to be used to separate the reactive metals, so they were not discovered until electricity was in use.
888694
There are a few ways to approach this problem.\n\nFirst, on the left side of the periodic table, most elements are cationic in nature--that is, they like to form a positively charged ion. Elements on the right side of the periodic table tend to be anionic, or negavitely charged.\n\nSecondly, elements on the left side of the periodic table are predominantly metals. Those on the right side of the periodic table are mainly non-metals.\n\nAnother significant difference between the left and right sides of the periodic table is the atomic radii of the elements. Elements to the right side of the periodic table are larger in radius than the elements to the left side of the periodic table.\n\nFinally, elements on the right side of the periodic table are usually (although not always) more electronegative than those found on the left side of the periodic table.\n\nI hope this is enough information to help you with your problem. Good luck!
923944
Are you referring to the exercise on this page:\nhttp://galileo.phys.virginia.edu/outreach/8thgradesol/PeriodicTable.htm\n\nI had never heard of that before (I teach chemistry); sounds like an amusing exercise! Only I can't see why they'd call Francium an element in group13 (IIIA) and period 4 when it is already a real element in group 1A, period 7! Good luck! I'm assigning Gas Law homework currently and have very little time, or else I'd do the exercise!
237935
francium. mercury is technicaly not a metal, it just has a low melting point, low metling points do not make it unstable. if that were the case, then oxygen would be VERY unstable ITS ALREADY TURNED INTO VAPOR!!!
1013374
In chemistry, a metal (Greek: Metallon) is an element that readily forms ions (cations) and has metallic bonds. Metals are sometimes described as a lattice of positive ions (cations) surrounded by a cloud of delocalized electrons. The metals are one of the three groups of elements as distinguished by their ionisation and bonding properties, along with the metalloids and nonmetals. On the periodic table, a diagonal line drawn from boron (B) to polonium (Po) separates the metals from the nonmetals. Elements on this line are metalloids, sometimes called semi-metals; elements to the lower left are metals; elements to the upper right are nonmetals.
153314
If it counts as a chemistry discovery, the periodic table is definitely the most important.  It allows chemists to predict the chemical properties of known and undiscovered elements, including boiling and melting points, reactivity, and potential bonding.  It also provides the basis for determining the formulae of molecules and compounds, which is absolutely fundemental for chemistry.  Any chemist will tell you that the periodic table is an essential tool for chemistry.
476156
The Periodic Table of the Elements, as developed by Mendeleev.
336969
You answered your own question. They're arranged in order of weight. Okay, they're not in perfect order, but nearly every periodic table lists the ordinal (1,2,3,4...etc) atomic weight right on it.
309159
The discovery of the periodic table was based upon behavior as determined by the skeptical chymist.  A new element meant unique behavior on the part of the element and so the behavior was identified, and the element associated with it.
498169
Here you go: http://en.wikipedia.org/wiki/Periodic_table\n\nAhhh.. good old Wikipedia. :)
30888
I'm not really sure what you mean, but here's a good site to look at the periodic table.\n\nhttp://en.wikipedia.org/wiki/Periodic_table
223202
goto http://www.webelements.com/ or better stillhttp://www.schoolscience.co.uk/periodictable.html run over the element with your mouse it tells you what it is
1012358
Osmium is densest followed by Irridium\nOs\nOsmium is the densest element known and the hardest of all platinum\ngroup metals (PGMs). It is 10 times harder than platinum itself.\nOsmium also has a higher melting point than the other PGMs.\nP r o p e r t i e s\nElectrical conductivity 0.109 106 cm-1 Ohm-1\nDensity 22.61 g/cc\nHardness (Brinell value) 3920 MN m-2\nMelting point 3050 ºC\nRarity 1x10-4 ppm in lithosphere\nAtomic number 76\nAtomic weight 190.23\nElectrical resistivity 8.12 microhm.cm at 0°C\nThermal conductivity 87 watts/metre/°C\n\nHeaviest element I think is Francium\nFrancium is a chemical element in the periodic table that has the symbol Fr and atomic number 87. This is a highly radioactive alkali metal that is found in uranium and thorium ores. \nThis element, which was named for France, was discovered in 1939 by Marguerite Perey of the Curie Institute in Paris. Francium is the heaviest alkali metal and occurs as a result of actinium's alpha decay and can be artificially made by bombarding thorium with protons. \n\nEven though it naturally occurs in uranium minerals, it has been estimated that there might be less than 30 grams of francium in the crust of the earth at any one time. It is the most unstable element among the first 101 and has the highest equivalent weight of any element. \n\nThere are 41 known isotopes of francium. With a 22 minute half life, the longest lived isotope of this element is 223Fr which is a daughter isotope of 227At and is the only isotope of francium that occurs naturally. All known isotopes of francium are highly unstable, therefore knowledge of the properties of this element only comes from radiochemical procedures. \n\nA small number of pictures of francium have been taken but only of at the most 200,000 atoms at a time. The pictures were taken by trapping the atoms and using a special fluorescent imaging camera.
719528
do the project on electronic configurations of different elements or on the characteristics of each element in the periodic table such as lithium is the metal lighter than water, element with highest affinity is chlorine and things like that. u can do this for each and every element. another thing is that the periodic table has been completed so u can do some project relating to that.
783753
The atoms increase in size as you move down the group, because each atom has an additional energy level or shell that contains the valence electron.\n\nWhen atom of group one metals form ions, they lose the valence electron, which causes them to decrease in size.\n\nThe smallest ion will be at the top of the column, since it starts out as the smallest atom,  and the largest ion will be at the bottom.