The isotope sodium 20 has how many neutrons

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

What prefix multiplier is appropriate for reporting a measurement of 5.57 ×10−5 m?

Answer immediately when two or more atoms of the same element are in a chemical bond, the substance is called a(n) a. compound b. molecule c. nucleus