The covalent radii of atoms $A$ and $B$ are $r_A$ and $r_B$, respectively. The covalent bond length and total length of $AB$ molecule are respectively

  • A
    $(r_A + r_B), 2(r_A + r_B)$
  • B
    $\frac{1}{2}(r_A + r_B), (r_A + r_B)$
  • C
    $(r_A + r_B), (r_A + r_B)$
  • D
    $2(r_A + r_B), \frac{1}{2}(r_A + r_B)$

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