Discussion
The metal borides that contain isolated boron atoms are:
Answer: A
The borides with isolated boron atoms are Tc7B3 and Re7B3.
In metal borides the arrangement of boron follows the metal-to-boron ratio. When metal is in large excess, as in M3B and M7B3, the boron atoms are too far apart to bond to one another and sit isolated in holes of the metal lattice.
As the boron content rises, boron atoms link up: M3B2 borides such as V3B2 contain B2 pairs, monoborides such as TiB and HfB contain zigzag chains of boron, and M3B4-type borides such as V3B4 contain double chains. So the options containing V3B2, V3B4, or TiB and HfB all include borides with boron-boron bonds.
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