to draw the lewis electron-dot symbol for a main-group element, first determine the number of electrons by noting the number of the element. place one for each electron on each of the four sides of the element symbol, pairing them up once each site has an electron.

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how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

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in the analysis of systems that involve fluid flow, we frequently encounter the combination of properties u and pv.

warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

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answer; the numbers of valence electrons in the acetic acid molecule (ch3co2h) is 24;