Remember that all the alkali metals react vigorously with halogens to produce salts, as the halogens needs one electron to complete its octet and alkali metals can readily lose electrons to have an oxidation state of $ +1. In this video (Part 1 of 2), we take a look at metals, wh. Cesium is second from the bottom of this group, with six electron shells, so it fits all the characteristics of a reactive atom, therefore making it the most reactive element. In this short series, we look at what makes certain elements really reactive and others just.not. Down to the Francium the reactivity must be slightly decreased due to the heavy nuclei.Īlkali metals (situated far away from transitional metals and noble gases) are the most reactive element group. There is no relation of radioactivity and tendency to forming compounds. Due to that heavy nuclei the interactions between the nucleus and the electron is more and hence it requires high energy to remove an electron from the outermost shell. From the table, note that the most reactive metal on the periodic table is cesium. But it is not the case, Francium has a heavier nucleus than Cesium and it causes radioactivity. $Īs we know that reactivity increases down the group, so, you must be thinking that Francium is looking more reactive. ![]() They tend to donate their electrons in reactions and have an oxidation state of $ +1. Alkali metals are among the most reactive metals in the periodic table and this is due to their larger atomic radii and low ionization energies. In the periodic table, cesium is the most reactive metal while fluorine is the most reactive nonmetal. It is its willingness to lose an electron completely and form a positively charge ion that makes caesium the most reactive metal in the periodic table, and yes I am including its relative francium. Reactivity of elements increases down the group. Members of a group typically have similar properties and electron configurations in their outer shell. They easily react with water to form an alkaline metal hydroxide solution and hydrogen. ![]() The elements are generally soft, reactive metals with low melting points. For example, Noble gases have low reactivity because they have full electron shells. Hint :We know that the number of electrons in the outermost shell of an atom and its tendency to lose electrons determines its reactivity.
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