Why do elements in the same group or column of the periodic table have similar properties? a. they have the same number of protons. b. they have the same number of neutrons. c. they have the same number of outer shell electrons. d. they have the same number of electron shells.

explanation:

as the height from which the ruler was dropped increased, the speed of the ruler at ryan's hand increased.

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

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