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The positions of three elements `A,B` and `C` in the periodic table are shown here (a) State whether `A` is a metal or non-metal? State whether `C` is more reactive or less reactive than `A` (c) Will `C` be larger or smaller in size than `B`? (d) Which type of ion, cation or anion, will be formed by element `A`? |
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Answer» (a) Element `A` is in group 17. Now, group 17 is one the right side of the periodic table whre non-metals (called halonges) are placed. So, element `A` is non metal. It is a haloven. (b) In group 17 of halogens, the chemical reactivity decreases on going down in a group. Thus, element `C` will be less reactive than element `A`. (c) On going from left to right in a period, the side of atoms decreases. So, the atom of `C` will be smaller in size than an atom of `B`. (d) Element `A` of group 17 has 7 valence electrons. So it will accept 1 electron to form a negatively charged ion `A^(-)`. The negatively charged ionis called an anio. Thus, elements of the periodic table are as follows: |
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