define energy shells
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❤️→→→||→→→In chemistry and atomic physics, an electron shell, or a principal energy level, may be thought of as an orbit followed by electrons around an atom's nucleus. ... The electrons in the outermost occupied shell (or shells) determine the chemical properties of the atom; it is called the valence shell.←←←||←←←❤️
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the process of metabolism in which cells obtain energy in the form of ATP by causing glucose and other food molecules to react with with oxygen
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