The ionic radius generally increases down a group on the periodic table and decreases across a period. This is due to the increase in the principal quantum number (n) down a group which increases the size of the electron cloud and the increase in effective nuclear charge across a period which pulls the electron cloud closer to the nucleus.

Here are the elements in the question listed in order of their positions on the periodic table:

- Ca2+ (Calcium ion)
- K+ (Potassium ion)
- Cl- (Chloride ion)
- Ar (Argon)

Argon is a noble gas and does not typically form ions, so we can exclude it from consideration.

Between Ca2+, K+, and Cl-, the ion with the largest ionic radius is the one furthest down and to the left on the periodic table, which is K+ (Potassium ion).

So, K+ has the largest ionic radius among the given options.

Question

The ionic radius generally increases down a group on the periodic table and decreases across a period. This is due to the increase in the principal quantum number (n) down a group which increases the size of the electron cloud and the increase in effective nuclear charge across a period which pulls the electron cloud closer to the nucleus.

Here are the elements in the question listed in order of their positions on the periodic table:

- Ca2+ (Calcium ion)
- K+ (Potassium ion)
- Cl- (Chloride ion)
- Ar (Argon)

Argon is a noble gas and does not typically form ions, so we can exclude it from consideration.

Between Ca2+, K+, and Cl-, the ion with the largest ionic radius is the one furthest down and to the left on the periodic table, which is K+ (Potassium ion).

So, K+ has the largest ionic radius among the given options.

Knowee AI · Accepted Answer

The ionic radius generally increases down a group on the periodic table and decreases across a period. This is due to the increase in the principal quantum number (n) down a group which increases the size of the electron cloud and the increase in effective nuclear charge across a period which pulls the electron cloud closer to the nucleus.

Here are the elements in the question listed in order of their positions on the periodic table:

- Ca2+ (Calcium ion)
- K+ (Potassium ion)
- Cl- (Chloride ion)
- Ar (Argon)

Argon is a noble gas and does not typically form ions, so we can exclude it from consideration.

Between Ca2+, K+, and Cl-, the ion with the largest ionic radius is the one furthest down and to the left on the periodic table, which is K+ (Potassium ion).

So, K+ has the largest ionic radius among the given options.

17. Which of the following has the largest ionic radius?Ca2+K+Cl-Ar

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