I need help real fast

Based on its chemical properties, identify the position of each chemical family on the periodic table.

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

How many neutrons does an element have if its atomic number is 50 and its mass number is 166