The Rydberg equation only works for the Hydrogen and Hydrogen-like (species with only one electron) however because Bohr model of the atom breaks down when there are more than two electrons. A more sophisticated theory of the atom was needed in order to determine the energy due to electron-electron repulsion. Does the Rydberg formula work for all elements? The Rydberg equation only works for hydrogen because it is an empirical formula that is based on the Bohr model of the hydrogen atom and can only apply to it and other hydrogenic species.

Why did China isolate itself in the 15th century? Ming emperors decided to isolate China to protect the country from European influences. Why did Chinese isolate themselves? The geography of China isolated it from other cultures because there were the Himalayan Mountains, the Tibet-Qinghai Plateau, the Taklimakan Desert, and the Gobi Desert. Cold climates also kept invaders out. … These physical features made Inner China a better place to settle down and grow crops.

Hopscotch is a popular playground game in which players toss a small object, called a lagger, into numbered triangles or a pattern of rectangles outlined on the ground and then hop or jump through the spaces and retrieve the object. It is a children’s game that can be played with several players or alone. How do you play hopscotch at home? The player tosses the object into the first square making sure the object lands within the square.

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For best results, replace your cartridge every 2 months or after 60 tank refills to keep your water tasting pure and chlorine-free. Includes 6 water filter cartridges (12-month supply). Water Filters help remove chlorine from your water and should be changed every 2 months, or 60 tank refills. What happens if you don’t change Keurig filter? What happens if you don’t change Keurig filter? If you don’t change the Keurig filter the water will become dirtier and less clean over time.