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Plain

In physical geography, a plain is a flat, largely treeless expanse of land. Famous plains can be found in North America and in Russia.



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Periodic table

... are filled in roughly this order: 1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d 7p 8s 5g 6f 7d ...