Ionic radius trend

What is ionic radius?

• How big an atom is when it is neutral.

• How big an atom is when it becomes an ion.

• The distance from the nucleus to the outermost electron shell in a neutral atom.

• The size of an atom's nucleus.

How does gaining or losing electrons affect the size of an atom?

• Gaining electrons decreases size, losing electrons increases size.

• Gaining electrons increases size, losing electrons decreases size.

• Gaining electrons has no effect on size, losing electrons decreases size.

• Losing electrons has no effect on size, gaining electrons increases size.

When a metal atom forms a cation, how does its ionic radius compare to its atomic radius?

• The ionic radius is larger than the atomic radius.

• The ionic radius is smaller than the atomic radius.

• The ionic radius is the same as the atomic radius.

• The ionic radius can be larger or smaller depending on the metal.

When a nonmetal atom forms an anion, how does its ionic radius compare to its atomic radius?

• The ionic radius is larger than the atomic radius.

• The ionic radius is smaller than the atomic radius.

• The ionic radius is the same as the atomic radius.

• The ionic radius can be larger or smaller depending on the nonmetal.

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Which of the following ions, all having 10 electrons, would have the largest ionic radius: Na+, Mg2+, Al3+?

• Al3+

• Mg2+

• Na+

• They would all have the same ionic radius.