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The closest shell to the nucleus is called the 1 shell followed by the 2 shell then the 3 shell and so on farther and farther from the nucleus. Electron shell - Dictionary Definition. Potassium Atom Showing Electrons In Their Shells Gcse Chemistry Electrons Chemistry Relating Shells Subshells and Orbitals. . These shells accommodate the electrons of the atom. In chemistry and atomic physics an electron shell also called a principle energy level may be thought of as an orbit followed by electrons around an atoms nucleus. Are arranged in different shells around the nucleus. Each energy level is given a number called the principal quantum number n. Electron shells usually consist of one or more subshells. Answer 1 of 7. Electrons in atoms are in shells shown as circles around the nucleus. Each of the electrons in a particular electron shell possesses a discrete amount of energy designated by a quantum number nThose with the leas...