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The position of three elements A, B and ...

The position of three elements A, B and C in the Periodic Table are shown below:

(a) State whether A is a metal or a non-metal.
(b) 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?

Text Solution

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(a) Metals lie on the left-hand side of the Periodic Table whereas non-metals are found on the right-hand side. The element A is in group 17. Group 17 is on the right side of the Periodic Table. Thus, element A is a non-metal (called halogen).
(b) The chemical reactivity of non-metals decreases on going down in a group. In group 17, the chemical reactivity decreases on going down in a group. So, element C is less reactive than A.
(c) The atomic size decreases in moving from left to right along a period. So, atom C will be smaller in size than B.
(d) The element A of group 17 has 7 valence electrons. So, it will gain one electron to form a negatively charged ion `(A^-)` . The negatively charged ion is called an anion. So, element A will form an anion.
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