Question

The bond lengths of diatomic molecules of elements X, Y, and Z respectively are 143, 110, and 121 pm. The atomic numbers of X, Y, and Z respectively are:

• A. \( 9, 7, 8 \)
• B. \( 7, 8, 9 \)
• C. \( 9, 8, 7 \)
• D. \( 7, 9, 8 \)

Hint:

Diatomic molecules' bond lengths are influenced by atomic size and electronegativity trends.

Answer 1

The Correct Option is A

- The bond length of a diatomic molecule depends on atomic size.
- Fluorine (F) has an atomic number 9 and forms a bond with a length of 143 pm.
- Nitrogen (N) has an atomic number 7 and forms a bond with a length of 110 pm.
- Oxygen (O) has an atomic number 8 and forms a bond with a length of 121 pm.
- Hence, the correct sequence of atomic numbers is \( 9, 7, 8 \).
Thus, the correct answer is: \[ \boxed{9, 7, 8} \]