Three elements of `3^(rd)` period x,y,z such that the oxide of X is acidic, y is amphoteric and z id basic, the order of atomic no of three elements isL

Options

A. `xgtygtz`
B. `ygtxgtz`
C. `zgtxgty`
D. `xgtzgty`

Answer

To solve the problem, we need to identify three elements from the third period of the periodic table based on the nature of their oxides: one that is acidic, one that is amphoteric, and one that is basic. We will also determine the order of their atomic numbers.

### Step-by-Step Solution:

1. **Identify the Elements in the Third Period:**
The elements in the third period are:
- Sodium (Na, atomic number 11)
- Magnesium (Mg, atomic number 12)
- Aluminum (Al, atomic number 13)
- Silicon (Si, atomic number 14)
- Phosphorus (P, atomic number 15)
- Sulfur (S, atomic number 16)
- Chlorine (Cl, atomic number 17)
- Argon (Ar, atomic number 18)

2. **Determine the Nature of Oxides:**
- **Acidic Oxide:** The oxides of non-metals are generally acidic. In the third period, the most acidic oxide is that of Phosphorus (P), which forms P₂O₃.
- **Amphoteric Oxide:** Aluminum (Al) forms Al₂O₃, which is amphoteric as it can react with both acids and bases.
- **Basic Oxide:** The oxides of metals are generally basic. Magnesium (Mg) forms MgO, which is a basic oxide.

3. **Assign Elements to X, Y, Z:**
- Let X be Phosphorus (P) - acidic oxide (P₂O₃).
- Let Y be Aluminum (Al) - amphoteric oxide (Al₂O₃).
- Let Z be Magnesium (Mg) - basic oxide (MgO).

4. **Determine the Order of Atomic Numbers:**
- Atomic number of X (P) = 15
- Atomic number of Y (Al) = 13
- Atomic number of Z (Mg) = 12

Therefore, the order of atomic numbers from highest to lowest is:
- X (P) > Y (Al) > Z (Mg)

5. **Final Order of Atomic Numbers:**
The order of atomic numbers of the elements X, Y, and Z is:
- X (P, 15) > Y (Al, 13) > Z (Mg, 12)

### Conclusion:
The order of atomic numbers for the elements X, Y, and Z is: **15 (P) > 13 (Al) > 12 (Mg)**.