The property of a moving object that makes it hard to stop is

3. on your graph, the data points between the black squares are data for elements with atomic numbers 3 through 9. locate these elements on your periodic table. what term or description would you use to identify these elements with respect to the periodic table?

Can anybody me with this? ? (picture included.)

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f