Boron has an acidic oxide, that means it has a strong p+ presence that will attract the OH- group from water and leave the solution with free H+ . So, the proton added to form Boron as we move across the periodic table is likely to be outside of the 2+ nucleus.
And the inter-atomic bonding in its lattice is likely to be,
Each atom is bonded to three other atoms. Boron lattice has no free electrons it is not as reactive nor conductive.