Which of these substances are most likely crystalline solids? select all that apply. diamond sugar rubber salt (nacl) wood ice flour

Crystalline substance have a definite arrangement of atoms, ions or molecules in a regular repeating pattern. The following are crystalline substances:

The common thread that holds all crystals together is the presence of a regular repeating unit. This regular repeating unit may be atoms, molecules or ions.

Crystals are usually highly ordered owing to inter-molecular or ionic interactions which help the constituents of the crystal to maintain a definite shape and form.

All the substance listed above have regular repeating units hence they can rightly be classified as crystals.

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nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.