In an ice crystal, each water molecule is hydrogen bonded to four neighboring molecules. This arrangement is due to the tetrahedral geometry of ice. Each water molecule can form up to four hydrogen bonds because the central oxygen atom has two lone pairs of electrons and two hydrogen atoms available for bonding. The structure of ice is such that each molecule is bonded to 2 others via its hydrogen atoms and to 2 others via lone pairs, achieving the tetrahedral configuration. Thus, the number of hydrogen bonds aligns with the given range, fitting neatly into the stipulated values of 4,4.
