Ncert Exercises & Solutions

Choose the correct order of atomic radii of fluorine and neon (in pm) out of the options given below and justify your answer.

1. 72, 160

2. 160, 160

3. 72, 72

4. 160, 72

(a) Atomic radius of f is expressed in terms of covalent radius while, atomic radius of neon is usually expressed in terms of can der Waals' radius. van der Waals' radius of an element is always larger than its covalent radius.

Therefore, atomic radius of F is smaller than atomic radius of

Ne (F=72 pm, Ne=160 pm)

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