Arizona often has hot, dry weather. casey wonders what could cause weather like this and looks up the different kinds of air masses. what kind of air mass would most likely bring this sort of weather?

A Warm Front

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The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.