Which electron configuration represents the electrons of an atom in an excited state?
(1) 2-1 (3) 2-8-7
(2) 2-7-4 (4) 2-4

< > according to newton's third law of motion, forces always act in equal but opposite pairs. another way of saying this is for every action, there is an equal but opposite reaction.< >

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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