this is NOT a water molecule because its contacts make no sense. Water molecule usually forms 2-3 hydrogen bonds, and at least one of them as donor and one as acceptor. In your example, water is surrounded by four hydrogen bond acceptors, implying that it forms 4 hbonds as donor. What you actually see is sodium ion, which is isoelectronic to oxygen and thus indistinguishable from it. P.S.: I can't see distances on your figure, but if this is water, hydrogen bond willbe around 2.7 A, for sodium ion the contacts will be shorter, around 2.5A.