There are two main ways that minerals are classified. which identifies those two main ways?

a. country of origin and chemical makeup

b. chemical makeup and use

c. crystal structure and economic value

d. use and economic value

A mineral is a naturally occurring inorganic crystalline solid that are the building blocks of rocks. Rocks are made up of different minerals. The most appropriate answer is c. crystal structure and economic value. Some minerals are classified as semiprecious or precious because of their economic value.  Minerals such as diamonds and emeralds are precious and are very valuable. 

If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom