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d) Atoms are of various kinds. Most of the d- block elements (transition metals) shows variable valency. So, iron has the valency of 2 and 3 respectively in these compounds. (d) Iron: Valency is 2 and 3, Fe^{2+} is ferrous and Fe^{3+} is ferric. Certain elements show more than one valency which is called variable valency. a) Boron b) Phosphorous c) Chlorine d) Flourine. ICSE/Std VIII/Chp 5- Language of Chemistry- variable valency - Duration: 4:13. Copper has two valencies: +1 and +2 and the corresponding atoms are termed as Cuperous (+1 valency) and Cupric (+2 valency). Periodic Trends in the Oxidation States of Elements, 1. Notes of all chapters of Science for Diploma Exam. has variable valency reason for variable valency : Valency is – the number of electrons lost or gained from the outer shell of an atom of an element – during chemical reaction. But the valency of elements, when combined with H or O first, increases from 1 to 4 and then it reduces to zero. Alkali Metals such as Na, K, Rb, -Li, Cs; have +1, And Alkali Earth Metals have +2 such as Mg, Ca, Ba, -Be, Sr, etc. Representation of variable valency of metals Oxidation State and valency are one of the most fundamental properties of elements and can be studied with the help of electron configurations. Thus option D is correct.Hence, all the options are correct. Variation Of Oxidation State within a Group, Guidelines for assigning the Oxidation States. (D) Anhydrous Hg does not show variable valency. Variable valency. Hence, all the elements of one group have the same valency. But in Metal Hydrides, such as NaH, LiH, etc, it has -1, Some elements have the same oxidation states as in their compounds such as. Oxygen has an oxidation state of -2. so it can be Hg or Hg 2 . Hg has a valency of +1 and +2 in +1 valency it's called mercurous and in +2 valency its called mercuric. Also used in electrical switches and mercury-vapor lighting products. Many elements have a common valence related to their position in the periodic table, and nowadays this is rationalised by the octet rule.The Greek/Latin numeral prefixes (mono-/uni-, di-/bi-, tri-/ter-, and so on) are used to describe ions in the charge states 1, 2, 3, and so on, respectively. 24 (C) Mercury forms alloys with all metals except iron and platinum. (A) Mercury is silver - white shining heavy liquid. Name Origin From the Roman god Mercury; symbol from Latin: hydrargyrus (liquid silver). are some compounds who have variable valency and Hg is one of them. Hope, it proves helpful to you. (2016). While these are the most common valences, the real behavior of electrons is less simple. Q3) Explain the term ‘variable valency’. Post was not sent - check your email addresses! 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