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#1. Ions with opposite charges form ____ bonds.

#2. An aggregate of minerals is a ____.

#3. The most common atom in the Earth’s crust is oxygen.

#4. Two atoms with the same number of protons but different mass are called isotopes.

#5. Minerals that can be mined at a profit are called___________

#6. The central region of an atom that holds the protons and the neutrons is called the ____

#7. Quartz is the hardest mineral that occurs naturally

#8. Rare and precious minerals are called ores.

#9. When a mineral is broken into pieces and does not exhibit cleavage it is said to ______

#10. Feldspar is a carbonate mineral.

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