Which of the following ions has the smallest radius?

Which of the following ions has the smallest radius?

Step 1: Understand that ions are charged atoms. Positive ions (cations) have lost electrons.
Step 2: Know that when an atom loses electrons, it becomes smaller because there is less electron-electron repulsion.
Step 3: Recognize that the more positive charge an ion has, the smaller its radius will be.
Step 4: Compare the ions given in the question based on their positive charges.
Step 5: Identify that Si4+ has the highest positive charge (4+), meaning it has lost the most electrons.
Step 6: Conclude that Si4+ will have the smallest radius among the ions listed.

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