Question

How does the tendency to gain electrons change as we go down in group 17 of the periodic table

Answer 1

The tendency to gain electrons (electronegativity) decreases as the atomic radius increases due to the increase in number of shells.This results in decrease in effective nuclear charge.Hence it is easy to loose an electron instead of gaining.

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Answer 2

The tendency to gain electrons change as we go down in group 17 of the periodic table increases from fluorine to chlorine and decreases from bromine to iodine.

Explanation:

• Elements of group 17 are non-metals and when we move from fluorine to chlorine then there occurs an increase in tendency of the atoms to gain electrons. But tendency to gain electrons decreases from bromine to iodine.

• This is because fluorine is smaller in size and when an electron approaches it then due to its smaller size there will occur repulsion of electrons. As a result, tendency to gain electron will be less.

• But as size of chlorine is larger than fluorine so, it will readily gain an electron because there will be less electronic repulsion. Whereas size of bromine and iodine is larger than chlorine hence, there is less force of attraction exerted by its nucleus towards the electrons.

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