Question

Which of the following ions has the smallest radius?
(1) F– (3) K+
(2) Cl– (4) Ca2+

Answer 1

(1) F-
fluorine has the smallest number of principle energy levels compared to the other three atoms
hope this helps! :-)

Answer 2

1)
`F^-`

Step-by-step explanation:

The ion that has the smallest atomic radius is
`F^-`.

This is because fluoride is the most electronegative element, which means that electrons are more attracted to the nucleus.

As the electrons feel a greater attraction this makes them "closer" to the nucleus reducing the atomic radius