Thus, transition elements show variable valencies due to involvement of penultimate d shell electrons. 2) Copper (Cu) can show a valency of 1 and 2 3) Phosphorus can show a valency of 3 and 5 Reason for occurance of variable valencies: 1) Involvement of available of vacant sub-shell in bonding. (i) Transition metals show variable valency because the energy subshell (n â 1) d and n s are very close. Its outer electronic configuration is 3 d 1 0 4 s 2 . Why do elements show variable valency? Why do elements show variable valency? What is the definition of variable valency? Transition metals form compounds in which they display more than one valency. Regards Some elements show variable valency because of the different electronic configurations. Thus in the case of iron, we get the divalent Fe(II) state when only the 2 electrons in the 4s orbital are removed. Related questions 0 votes 1 answer Why do some elements show variable valency ? Get an answer for 'Why does the element Iron have a variable valency, sometimes Fe+2 and sometimes Fe+3?' they have variable valency. An atom of an element can sometimes lose more electrons than are present in its valence shell i.e. Periodic Table With Element Valences This information is available on a Color Periodic Table of the Elements or a Black and White version. If copper shows valency 1 or Cu(I) then its known as Cuperous while when its shows (i) They do not show variable valency except mercury (ii) Many of their compounds are white. I'm a tenth grader presently n I've some doubts in chemistry. and find homework help for other Periodic Table questions at eNotes Valency is the number of hydrogen atoms that can combine with (or displace) one atom of the element to form a compound. Solution for (a) Why do transition elements show variable oxidation states? In chemistry, the term transition metal (or transition element) has three possible definitions: The IUPAC definition[1] defines a transition metal as "an element whose atom has a partially filled d sub-shell, or which can give rise to cations with an incomplete d sub-shell". So, they tend to lose only 2 electrons from their outermost shell. (ii) They show variable valency, which most main group elements do not. How do you find out valency of ⦠Thus possibility to lose electron from n s subshell as well as from ( n â 1 ) d subshell is very much if there are unpaired electrons. Examples of Iron A simpler version listing only the most common valence charges is also available. Transition metals can lose electrons not only from external shell of electrons but also from the penultimate shell. (a) The ability of the transition metal to exhibit variable valency is generally attributed to the availability of more electrons in the (n-1)d orbitals which are closer to the outermost ns orbital in energy levels. Why do elements show variable valency? But the problem lies in case of transition metals. Of the familiar metals from the main groups of the Periodic Table, only lead and tin show variable oxidation state to any extent. Valency is the combining capacity of the elements to form compounds. Do Some Elements Have Variable Valencies? Why do some elements show variable valency ? Most of the transition elements show variable valences. Transition metals can lose electrons not only from external shell of electrons but also from the penultimate shell. Hence these elements show two or more different valencies i.e. All I know is that in case of all d elements (wid atomic numbers ranging from 1-20) d valency is the number of electrons in d valence shell (in metals) and the number of valence electrons subtracted from 8 (in nonmetals). Valency of Copper â Copper is a transition element. Once again, lead makes compounds with valencies of both 2 and 4, while zinc typically has only compounds where it ⦠Click hereðto get an answer to your question Variable valency is exhibited by: Transitional elements exhibit variable valency as transition elements have both s electrons of outermost shell and d electrons of the penultimate shell. Visit BYJUS to learn more about it. Question 2: Why do transition elements show variable oxidation states? Copper shows two valences 1 and 2. For example :- Mn can show 2 3,4,5,6,7 oxidation states. However, this variability is less common in metals apart from the transition elements. Hence electrons from both can participate in bonding. loss from the penultimate shell and hence exhibit more than 1 or variable valency. An atom of an element can sometimes lose more electrons than are present in its valence shell i.e. Transition metals show variable valency and these elements have d-orbital as penultimate orbital and the outermost orbital is the s-orbital. Fluorine is always -1. ⢠They show variable oxidation states ⢠They form colored ions and compounds. asked Nov 22, 2019 in Important Questions by gaurav96 Expert (3.7k points) 0 votes 1 answer What are the reason for exhibiting variable valency ? The transition metals (d block) can have variable oxidation states because they are able to loose a varying number of electrons from their d orbitals. Determine the oxidation state of the transition metal for an overall non-neutral compound: Manganate (MnO 4 2-) Why do transition metals have a greater number of oxidation states than main group metals (i.e. Transition elements show a variable valancy due to involvement of d-orbitlas electron in bonding. Transition elements also show variable oxidation states, tendency to form complexes, magnetic nature and other properties. Solution: In the transition elements, the energies of (n-1)d orbitals and ns orbitals are very close. Some elements show variable valency because of the different electronic configurations. For example, two atoms of hydrogen combine with one atom of oxygen to form water (H 2 O); so, the valency of oxygen is two. The elements having d-orbital as penultimate orbital and the outermost s-orbital, like transition metals, show variable valency. During the formation of the molecules of the compounds, atoms combine in certain fixed proportions. Now, the atomic number of Fe, Iron is 26 and the electronic configuration is (1s)2 (2s)2 (2p)6 (3s)2 (3p)6 (4s)2 (3d)6 (aufbau's principle). Asked by Wiki User 1 2 3 Answer Top Answer Wiki User Answered 2014-06-16 16:55:36 2014-06-16 16:55:36 Transition metals can ⦠(d-orbital) : some of the elements 3 In these elements the d-subshell is full, hence these are regarded as non-transition elements which is evident from the following characteristics. This is the most electronegative element and in any compound it the most electronegative element that determines the oxidation state of the elements. alkali metals and This is due to the variable oxidation states attainable by losing different numbers of ⦠(i) Name the element showing maximum number of oxidation states among the first⦠Social Science The two tables below show some examples of different compounds, their valence diagrams, and the valences for each element of the compound. 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