An architect is stacking pieces of plastic to make two columns in a model building. The diagram above shows the pieces of plastic before they touch each other. Use the information in the diagram to answer the question. After they have been touching for a while, which of the two top plastic pieces will be cooler, and why?

Your roll: experienced electron speech is adressed to: a new "freshman class" of electrons job: write a speech task: you are to pretend that you are giving a speech to a new group of electrons. be sure to mention their placement in an atom, their charge, and their role in chemical bonding (ionic and covalent) be specific!

Check the correct box to describe the periodic trends in electronegativity. electronegativity across a period: decreases. increases. electronegativity down a group: decreases. increases.

Design techniques and materials that reduce the negative environmental impact of a structure are referred to as