I'm a tenth grader presently n I've some doubts in chemistry. 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). Copper shows two valences 1 and 2. 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 … Transition metals show variable valency and these elements have d-orbital as penultimate orbital and the outermost orbital is the s-orbital. Melting and boiling points of the transition element: These elements show high melting and boiling points. Get an answer for 'Why does the element Iron have a variable valency, sometimes Fe+2 and sometimes Fe+3?' So, they tend to lose only 2 electrons from their outermost shell. Most of the transition elements show variable valences. and find homework help for other Periodic Table questions at eNotes (d-orbital) : some of the elements 3 Valence diagrams of a compound represent the connectivity of the elements, with lines drawn between two elements, sometimes called bonds, representing a saturated valency for each element. In excited state, the (n-1)d electrons become bonding and thus give variable oxidation states to the atoms of transition elements. Zinc does not show the variable valency as elements of d-block, because d-orbital is full. Visit BYJUS to learn more about it. Why do elements show variable valency? Solution for (a) Why do transition elements show variable oxidation states? However, this variability is less common in metals apart from the transition elements. Related questions 0 votes 1 answer Why do some elements show variable valency ? For example :- Mn can show 2 3,4,5,6,7 oxidation states. 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. Periodic Table With Element Valences This information is available on a Color Periodic Table of the Elements or a Black and White version. Transition elements show a variable valancy due to involvement of d-orbitlas electron in bonding. Valency is the number of hydrogen atoms that can combine with (or displace) one atom of the element to form a compound. Oxidation State All the transition elements, aside from the first and last individuals from the series, display various oxidation states. Solution: In the transition elements, the energies of (n-1)d orbitals and ns orbitals are very close. Do Some Elements Have Variable Valencies? Valency of Copper – Copper is a transition element. Click here👆to 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. To write the chemical formula for a compound it is best to use the S.V.S.D.F system. How do you find out valency of … 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. Some elements show variable valency because of the different electronic configurations. they have variable valency. But the problem lies in case of transition metals. The elements having d-orbital as penultimate orbital and the outermost s-orbital, like transition metals, show variable valency. Some elements show variable valency because of the different electronic configurations. (i) Name the element showing maximum number of oxidation states among the first… Social Science If this is directly related to the number of valence electrons an atom has, why do transition metals (ii) They show variable valency, which most main group elements do not. Examples of Iron Its outer electronic configuration is 3 d 1 0 4 s 2 . (i) They do not show variable valency except mercury (ii) Many of their compounds are white. A simpler version listing only the most common valence charges is also available. Why do some elements show variable valency ? 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). 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. An atom of an element can sometimes lose more electrons than are present in its valence shell i.e. Transition metals form compounds in which they display more than one valency. An atom of an element can sometimes lose more electrons than are present in its valence shell i.e. Valency is the combining capacity of the elements to form compounds. During the formation of the molecules of the compounds, atoms combine in certain fixed proportions. loss from the penultimate shell and hence exhibit more than 1 or variable valency. Transition elements also show variable oxidation states, tendency to form complexes, magnetic nature and other properties. (i) Transition metals show variable valency because the energy subshell (n − 1) d and n s are very close. I understand that the term valency refers to the number of bonds an element would be able to form with either chlorine or hydrogen. 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". Question 2: Why do transition elements show variable oxidation states? Hence these elements show two or more different valencies i.e. • They show variable oxidation states • They form colored ions and compounds. alkali metals and (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. 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 ? 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