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Two elements M and N belong to groups I and II respectively and are in the same period of the Periodic Table. How do the following properties of M and N vary? (i) Sizes of their atoms. (ii) Their metallic characters. (iii) Their valencies in forming oxides. (iv) Molecular formulae of their chlorides |
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Answer» (i) ‘M’ and ‘N’ belong to the same period but group I and II respectively. N is smaller than M as the atomic size decreases on moving from left to right across the Periodic Table. (ii) M is more metallic than ‘N’ because metallic character decreases from left to right as tendency to lose electrons decreases due to decrease in atomic size. (iii) The valencies of M and N are 1 and 2 respectively, valency across the period first increases then decreases. (iv) MCl and NCl2. |
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