The atomic radii in periodic table among elements from right to left

Options

A. Decreases
B. Increases
C. Remain constant
D. First decreases and then increases

Answer

**Step-by-Step Solution:**

1. **Understanding Atomic Radii:**
- Atomic radii refers to the size of an atom, typically measured from the nucleus to the outermost electron shell.

2. **Periodic Table Trends:**
- The periodic table is organized in such a way that elements are arranged by increasing atomic number (number of protons).

3. **Movement Across a Period:**
- When moving from left to right across a period in the periodic table, the atomic number increases. This means that the number of protons in the nucleus increases.

4. **Effect of Increased Nuclear Charge:**
- As the number of protons increases, the positive charge in the nucleus (nuclear charge) also increases. This increased nuclear charge attracts the electrons more strongly.

5. **Resulting Change in Atomic Radii:**
- Due to the stronger attraction between the nucleus and the electrons, the electrons are pulled closer to the nucleus. This results in a decrease in atomic radii.

6. **Conclusion:**
- Therefore, as we move from left to right in a period of the periodic table, the atomic radii decreases.

**Final Answer:**
- The atomic radii decreases from left to right in the periodic table.

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