Question

Give reasons for your answer

Answer 1

4) The ionic radius of metal is less than its atomic radius
Because metal ions are positive ions

Answer 2

Let me explain this by taking an example of Sodium (Na).

Sodium has 11 protons attracting 11 electrons.

When Na forms a cation of Na⁺, there are 11 protons and 10 electrons.

Now, 11 protons attract 10 electrons, so the effective force of attraction is more here, thus decreasing the radius.

Thus we can say , Ionic radius of a metal is less than its atomic radius.

Now, let us take an example of a non-metal.

Fluorine has 9 protons and 9 electrons.

It forms an anion F⁻ which has 9 protons and 10 electrons

Now, 9 protons attract 10 electrons; As the burden has increased, the effective force of attraction decreases.

Thus, the Ionic radius of a non-metal is greater than its atomic radius.