Which describes the elements in any given period of the periodic table? a. they have common chemical properties, such as reactivity. b. they are in the same family. c. their properties change according to a pattern as you go from left to right l. d. their properties change according to a pattern as you go from top to bottom.

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?