in the periodic table of elements the most reactive metals are found where?
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bottom left corner of the table
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The first 92 elements of the periodic table occur naturally (from hydrogen to uranium).\n\nBTW, in reference to earlier poster, some of the naturally occurring elements (radon, radium, uranium, others) are radioactive, as well.
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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.
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For this you should see the electronic configuration of those elements.\nThe metals with atomic number 21-30 are transition metals; they have outer 4s shell complete and the inner 3d orbital is 'in the process' of being filled up. They all have 2 outermost electrons in the 4s2 shell. \nIonization energy is the energy required in removing an outer most electron from a neutral atom. The transition metals and calcium have their outermost 2 electrons in 4s which means that their electrons experience the same force of attraction from the nucleus (being at the same distance from the nucleus) ; hence almost the same amount of energy will be required to overcome that attractive force to remove the electrons.
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go to www.google.com them write periodic table and than go to images and you'll see
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Mg more reactive than Al cuz it has lesser valence electrons to release,making it easier to achieve stable noble gas configuration
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The alkali metals and the alkali earth metals are the the first columns appearing the periodic table.  Each of the elements found in these groups has the ability to lose electrons, thus making them cations (they become positively charged by losing a negative charge).\n\nHowever, all elements need to have a complete valence shell, which means that their outermost electron shell must be full.  Any deficiency or excess of electrons in their outermost ring will make the elements either lose the excess electrons or gain more in order to completely fill their outermost electron shell.\n\nHydrogen, which is the first element in the periodic table, has only 1 electron.  If Hydgrogen donates this electron, it becomes known as a proton, usually denoted as H+.  If you are writing out equations, H+ will work fine.  Remember, with only one electron, a Hydrogen atom is only composed of one electron and one proton.  \n\nOther than Hydrogen, almost no element will completely lose all of its electrons.
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Sodium Na+ is a Metal. You will find it in group 1 of the periodic table (same group as Lithium (Li+) and Potassium (K+) just different periods). It is +1 because it has one vacant electron in the outer shell. Very reactive due to this one electron.
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1. C, 2. Cl, 3. Se. The closer the atom is to Fluorine on the Periodic table (excluding noble gases), the stronger the electron affinity. Fluorine is the strongest.
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The more reactive a metal, the greater tendency it has to form a positive ion in the context of a chemical reaction (e.g. Na => Na+ or Fe => Fe2+). This also implies that the reverse reaction becomes more difficult i.e. the more reactive a metal, the more difficult (and expensive) it is to extract from its ore and the metal is also more susceptible to corrosion with oxygen and water. \n\nTitanium, for example, has to be cast in a vacuum. \n\nActive metals once extracted and refined can then be hazardous - for example, lithium, sodium and potassium oxidise in the presence of water in a very exothermic reaction (causing fire/explosions!)
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Iridium (IPA: /ɪˈɹɪdiəm/) is a chemical element in the periodic table that has the symbol Ir and atomic number 77. A dense, very hard, brittle, silvery-white transition metal of the platinum family, iridium is used in high strength alloys that can withstand high temperatures and occurs in natural alloys with platinum or osmium. Iridium is notable for being the most corrosion resistant element known and for its significance in the determination of the probable cause of the demise, by a meteorite strike, of the dinosaurs. It is used in high temperature apparatus, electrical contacts, and as a hardening agent for platinum.
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An element is reactive because it is unstable.By reacting with other substances it tries to become stable.\nin case of metals or as u say positively charged elements,say,Li,Na,K...the atomic size is increasing on going down.As the size increases the the nuclear pull for the valence shell decreases,thereby making it easier to lose electrons.Thus,K easily loses electrons as compared to Na or Li and is therefore more reactive.\nin case of negatively charged atoms or non metals,the atomic size is again increasing for eg in case of F,Cl,Br..\nbut the case is opposite here.\nthe atom has to gain one electron in order to become stable.\nthe smaller the atom the more is the nuclear pull for the incoming electron and more readily it is accepted.\nthus in this case,reactivity decreases down the group.
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You need to look at the radius of the atom, and the number of protons in the nucleus.\n\nGroups I and 2 in the Periodic Table have large atoms, with good screening and low IE values.  The transition metal atoms are smaller, and the outer electrons are therefore harder to remove.
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The metal which is the furtherest to the right-hand top corner of the periodic table will be the most electronegative. Those who said fluorine didn't read the question properly because you are asked for a metal and fluorine, although the most electronegative 'element', is not a metal. In answering this question, I'm going to assume that the metalloids aren't included and not a subset of the cagetory of metals. The most electronegative metal would be aluminium (13). Have a look at the periodic table, it's the element which is closest to the top-right hand side but is still classified as a metal.
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Lithium #3 on the atomic table. has a valence of 1 so it is quite reactive. If this electron is stripped off then by the formula 2n^2 the remaining 2 electrons would be a complete valence and so it is very non-reactive.
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the periodic table is great because it ditinguishes the different shells (s, p, d and f) that are filled as you add electrons. eg. He has 2 s electrons (full shell)\nNe has 1s2, 2s2 and 2p6 (full shell).\nIt gets a little more complicated at d electrons (transition metals) but Mendeleev did a great first shot.
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Transition metal.\n\nName: Copper \nSymbol: Cu \nAtomic Number: 29 \nAtomic Mass: 63.546 amu \nMelting Point: 1083.0 °C (1356.15 K, 1981.4 °F) \nBoiling Point: 2567.0 °C (2840.15 K, 4652.6 °F) \nNumber of Protons/Electrons: 29 \nNumber of Neutrons: 35 \nClassification: Transition Metal \nCrystal Structure: Cubic \nDensity @ 293 K: 8.96 g/cm3 \nColor: red/orange