Chemistry · CHEMICAL BONDING AND MOLECULAR STRUCTURE

In a heteronuclear molecule \( \text{AB} \), the covalent radius of \( \text{A} \) is \( 77\text{ pm} \) and the bond length \( R \) is \( 143\text{ pm} \). Using the relation \( R = r_A + r_B \), calculate the covalent radius of atom \( \text{B} \).

1. A
   \( 220\text{ pm} \)
2. B
   \( 33\text{ pm} \)
3. C
   \( 66\text{ pm} \)
4. D
   \( 99\text{ pm} \)