The Electron Configuration: Quantum Numbers Video Lessons

Concept: Counting Electrons

# Problem: Fluorine can gain an electron to become fluoride (F−). What is the quantum number (following the numbering conventions) that describes the electron that was gained by fluorine.(a) n = 2,  ℓ  = 0, m ℓ  = 1, ms = -1⁄2(b) n = 2, ℓ = 1,  m ℓ  = 0, ms = -1⁄2(c) n = 3, ℓ = 1, m ℓ = 1, ms = +1⁄2(d) n = 2, ℓ = 1,  m ℓ  = 1, ms = -1⁄2(e) n = 2, ℓ = 1,  m ℓ  = -1, ms = -1⁄2

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Fluorine can gain an electron to become fluoride (F). What is the quantum number (following the numbering conventions) that describes the electron that was gained by fluorine.

(a) n = 2,  ℓ  = 0, m   = 1, ms = -1⁄2

(b) n = 2, ℓ = 1,  m   = 0, ms = -1⁄2

(c) n = 3, ℓ = 1, m  = 1, ms = +1⁄2

(d) n = 2, ℓ = 1,  m   = 1, ms = -1⁄2

(e) n = 2, ℓ = 1,  m   = -1, ms = -1⁄2

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