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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.
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What happens to atoms and chemical bonds during a reaction?
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Mechanical energy is when the amount of kinetic and potential energies added together remains the same. conserved created lost
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Carmen is load furniture and boxes onto a moving truck. she picks up boxes of her things, places them on a cart, and pushes the cart to the moving van. which term best describes the type of force carmen uses? a. contact b. friction c. gravity d. noncontact
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