Consider the following statements about an element 'X' with number of protons 13
(A) It forms amphoteric oxide
(B) Its valency is three
(C) The formula of its chloride is `XCl_(3)`
The correct statements(s) is/are

Options

A. only (A)
B. only (B)
C. (A) and (C)
D. (A), (B) and (C)

Answer

To solve the question regarding the element 'X' with 13 protons, we will analyze each statement provided:

1. **Identify the Element:**
The number of protons in an atom is equal to its atomic number. Therefore, an element with 13 protons has an atomic number of 13. Referring to the periodic table, the element with atomic number 13 is Aluminum (Al).

2. **Evaluate Statement (A):**
- Statement (A) claims that Aluminum forms an amphoteric oxide.
- An amphoteric oxide is one that can react with both acids and bases. Aluminum oxide (Al₂O₃) is known to be amphoteric.
- **Conclusion:** Statement (A) is correct.

3. **Evaluate Statement (B):**
- Statement (B) states that the valency of Aluminum is three.
- Aluminum has three electrons in its outermost shell (2, 8, 3). It typically loses these three electrons to form a +3 ion (Al³⁺).
- **Conclusion:** Statement (B) is correct.

4. **Evaluate Statement (C):**
- Statement (C) indicates that the formula of its chloride is XCl₃.
- Since we established that X is Aluminum (Al), we need to check the formula of Aluminum chloride.
- The valency of Aluminum is +3, and the valency of Chlorine is -1. To balance the charges, one Aluminum ion combines with three Chlorine ions, resulting in the formula AlCl₃.
- **Conclusion:** Statement (C) is correct.

5. **Final Conclusion:**
All three statements (A, B, and C) about the element 'X' are correct.

### Summary of Correct Statements:
- (A) It forms amphoteric oxide: **Correct**
- (B) Its valency is three: **Correct**
- (C) The formula of its chloride is XCl₃: **Correct**

### Final Answer:
All statements are correct.

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