Thermal energy means... the molecules are not moving since the object is at
absolute zero and, if you touched it, your hand would
freeze and fall off.
the molecules are moving even if the object is very
cold.

i'm assuming that the correct answer is indeed the first one/ "a"..

l dont know l am s sorry

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.