What does the atomic radius change down a column of the periodic table

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

What must occur for air masses to form fronts

The number of neutrons is equal to the atomic number minus the atomic mass. a. true b. false