The elements in group 17 of the periodic table are all called halogens. All halogens have the same atomic number.
atomic mass.
number of possible isotopes.
number of valence electrons.

Your pendulum clock which advances 1.0 s for every complete oscillation of the pendulum is running perfectly on earth at a site where the magnitude of the acceleration due to gravity is 9.80 m/s2. you send the clock to a location on the moon where the magnitude of the acceleration due to gravity is 1.65 m/s2.

Identical marbles are released from the same height on each of the following four frictionless ramps . compare the speed of the marbles at the end of each ramp. explain your reasoning

Diamond will scratch quartz. true or false