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Every orbital in a subshell is singly occupied with one electron before any one orbital is doubly occupied, and all electrons in singly occupied orbitals have the same spin.
Outermost electrons of an atom (in highest energy level). These determine the chemical properties of an element.
Electrons fill the lowest energy level subshell first before moving to the next level.
A bundle of energy that is released when an atom loses an electron, A bundle of light energy that is emitted as an electron in an excited state relaxes from a higher energy level to its normal, lower energy level
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