Which of the following minerals scratches fluorite mineral?
a. talc
b. diamond
c. gypsum
d. calcite

b. diamond

Explanation:

Diamond is the hardest known naturally occurring substance. And it will scratch any other minerals below it on the moh's scale of hardness.

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.

the answer is d. 74.02