Question: Q: What is the modern periodic table based on? A:
OPTIONS:
- element mass
- metallic number
- element density
- atomic number
Answer: atomic number

Question: Q: What state of matter is characterized by tiny particles separated by large distances, which do not experience any force of attraction or repulsion with each other? A:
OPTIONS:
- steam
- emissions
- liquids
- gas
Answer: gas

Question: Q: In what type of mining must tunnels be blasted into the rock so that miners and equipment can get to the ore? A:
OPTIONS:
- open-pit mining
- strip mining
- gold mining
- underground mining
Answer:
underground mining