Different textbooks use different terminologies when discussing the same chemical compounds, for example when discussing the minerals...
Elements / Compounds
- Sulfide minerals consist of metallic elements in chemical combination with the element sulfur
- Phosphate are a group of minerals of one or more metallic elements chemically associated with the phosphate compound PO4
- Sulfide ions (S$^2$-) bond with a number of positive ions to form the sulfides
- Phosphorous in the form of phosphate ions (PO4$^3$-) binds with positive ions to form the phosphate minerals
Are element/compounds and ions the same thing?
If they are the same, why the two terms?
Which is better terminology?
I'm just after a basic understanding of how elements form rocks and being able to differentiate between this terminology is beyond my layman abilities.