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Question

The position of three elements A, B and C in the Periodic Table are shown below –
Group 16 Group 17
- -
- A
- -
B C

d) Which type of ion, cation or anion, will be formed by element A?

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Solution

A forms an anion.
A belongs to group 17 in the periodic table. Thus it is a halogen. Halogens have 7 electrons in their valance shell. They have a tendency to gain one elecyton to complete their octet. Thus A have the valency of -1 and forms an anion.

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