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The properties of the elements (atomic/i...

The properties of the elements (atomic/ionic radii, electron gain enthalpy, ionization enthalpy, electronegativity, valence, oxidising/reducing power, acid/base character, etc.) which are directly or indirectly related to their electronic configirations are called periodic properties. These properties show a regular gradation on moving from left to right in a period or form top to bottom in a group. Down a group, the atomic/ionic radii, metallic character and reducing character increase while ionization enthalpy and electronegativity decrease. Along a period from left to right, atomic/ionic and metallic character decrease while ionization enthaloy, electronegativity, non-metallic character and oxiding power increase. However, electron gain enthalpy becomes less negative down a group butmore negative along a period. In contrast, inert gases have positive electron gain enthalpies which do not show may regular trend.
If the ionic radii of `K^(+)` and `F^(-)` are about `1.34 Å` each, then the expected value of atomic radii of K and F should be respectively:

A

2.31 and 0.64 `Å`

B

2.31 and 1.34 `Å`

C

`0.64 and 2.31 `Å`

D

`1.34 and 1.34 `Å`

Text Solution

Verified by Experts

The correct Answer is:
A

Since the size of K is larger than `K^(+) (1.34 Å )` and that of F is smaller than that of `F^(-)` (1.34 Å ) , therefore option (a) is correct.
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