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Ionic radius in a group while moving dow...

Ionic radius in a group while moving down

A

Remains same from top to bottom

B

Decreases from top to bottom

C

Increases from top to bottom

D

First increases and then decreases.

Text Solution

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The correct Answer is:
### Step-by-Step Solution 1. **Understanding Ionic Radius**: - The ionic radius is defined as the measure of an ion's size. It is influenced by the nuclear charge and the distance of the outermost electrons from the nucleus. 2. **Identifying the Trend in a Group**: - When considering a group in the periodic table (elements in the same vertical column), we need to analyze what happens as we move from the top of the group to the bottom. 3. **Increasing Principal Quantum Number**: - As we move down a group, the principal quantum number (n) increases. This means that additional electron shells are being added to the atoms. 4. **Effect of Additional Electron Shells**: - With each additional shell, the distance between the nucleus and the outermost electrons increases. This leads to a larger ionic radius. 5. **Influence of Nuclear Charge**: - Although the nuclear charge (the positive charge of the nucleus) increases as we move down a group, the effect of this increase is offset by the greater distance of the outer electrons due to the additional shells. 6. **Conclusion**: - Therefore, the overall effect when moving down a group is that the ionic radius increases. Thus, the correct answer to the question is that the ionic radius increases from top to bottom in a group. ### Final Answer: - The ionic radius **increases from top to bottom** in a group. ---
### Step-by-Step Solution 1. **Understanding Ionic Radius**: - The ionic radius is defined as the measure of an ion's size. It is influenced by the nuclear charge and the distance of the outermost electrons from the nucleus. 2. **Identifying the Trend in a Group**: - When considering a group in the periodic table (elements in the same vertical column), we need to analyze what happens as we move from the top of the group to the bottom. ...
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