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An element X (atomic number 17) reacts with an element Y (atomic number 20) to form a compound.(i) Write the position of these elements in the modern periodic table.(ii) Write the formula of the compound formed. Justify your answer in each case |
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Answer» (i) The position of elements X in the modern periodic table is group number 17 and period number 3. The position of element Y in the modern periodic table is group number 2 and period number 4. Electronic configuration of element X = 2, 8,7. It has 3 shells so period number 3. Halogens are kept in group 17. Electronic configuration of element Y = 2,8,8,2 It has 4 shells so a period number is 4. The valence shell has 2 electrons so the group number is 2. (ii) The formula of the compound: Valency of element Y =2 Valency of element X=1 YX2 |
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