Which phrase refers to the repeating pattern of a minerals particles

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

Chemistry worksheet - i am not sure what they are asking for exactly?

The famous scientist galileo galilei did several experiments with sloping planes, which he rolled metal balls down so that he could study motion. by changing the slope, he could study how the speed at which the ball rolled was affected. what was the independent variable in galileo's experiment? a. the speed of the ball b. the slope of the plane c. whether the ball moved d. what the ball was made of