The linear combination of atomic orbitals of two different atoms,each containing one electron,forms a ............ .

  • A
    $\sigma$-bond
  • B
    $\pi$-bond
  • C
    Double bond
  • D
    Coordinate covalent bond

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The electronic configuration of three elements $A$,$B$,and $C$ are given below. The bond between $B$ and $C$ will be:
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$C: 1s^2, 2s^2, 2p^6, 3s^2, 3p^5$

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Which one of the following bonds has the highest bond energy?

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