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The following observations are made about two hypothetical elements A and B: The A?A and B?Bbond lengths in elemental A and B are 2.65 and 1.84 Å, respectively. A and B react to form the binary compound AB2, which has a linear structure (that is ?B?A?B=180? ).

Based on these statements, predict the separation between the two B nuclei in a molecule of AB2

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Answer:

Explanation:

The concept of bond length is applied here. Bond length is the distance between the nuclei of atoms in molecules. it can be measured in different ways by X-ray diffraction. It should be noted that the shorter the bond length, the stronger the bond.

  • Given Bond length of A-A = 2ra, where ra = atomic radius of A
  • 2ra = 2.65 Å
  • similarly, bond length of B-B = 2rb = 1.84 Å, where rb = atomic radius of B
  • In AB2, separation between the two nuclei of B = rb + 2ra + rb
  • = 2rb + 2ra = 1.84 Å + 2.65 Å = 4.49Å

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