C. How does electronegativity change going down and across the periodic table? d. How does the radius of a positive and negative ion compare to a neutral atom?

Aradio signal from a gps satellite take only about 0.067 seconds to reach a gps reciever. if the speed of light is about 300,000km/s, then approximately how far away is the reciever from from the satellite?

What must occur for air masses to form fronts

What is the most important factor in determining climates.