Chemical inertness is the key property of helium determining its solubility, distribution and accumulation kinetics in metals. Against all expectations, our ab initio calculations show a substantial chemical bonding between He and Be atoms in the hcp-Be matrix when He occupies a non-symmetric position in a basal plane.
@article{arxiv.1111.4138,
title = {On chemical bonding of Helium with hcp-Beryllium},
author = {A. S. Bakai and A. N. Timoshevskii and B. Z. Yanchitsky},
journal= {arXiv preprint arXiv:1111.4138},
year = {2015}
}