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• • Quantum numbers help us understand where the electron is and describe the orbital occupied by the electron Quantum numbers tell us 4 things… • distance from the nucleus • shape • position • spin 1 The principal quantum number relates primarily to the main energy level of an electron. n = 1, 2, 3, 4, ... 2 The secondary quantum number relates primarily to the shape of the orbital. The number of values of l equals the volume of the principal quantum number. 3 4 5 6 The magnetic quantum number, ml, relates primarily to the direction of the electron orbit. The number of values for ml is the number of independent orientations of orbits that are possible. 7 The spin quantum number, ms, relates to the property of an electron that can best described as its spin. The spin quantum number can only be +1/2 or -1/2 for any electron. 8 9 Assigned Questions p. 182 Practice UC # 1, 2, 3, 4, 5 p. 184 Section 3.5 Question UC # 1, 2, 3, 4, 5, 6 10 11 12 13