Chapter 2 - Atoms and the Periodic Table - Problems - Page 60: 2.24

See explanation

a) Magnesium (Mg) — Atomic number: 12 Electron configuration: 1s² 2s² 2p⁶ 3s² Orbital diagram: Code 1s ↑↓ 2s ↑↓ 2p ↑↓ ↑↓ ↑↓ 3s ↑↓ b) Aluminum (Al) — Atomic number: 13 Electron configuration: 1s² 2s² 2p⁶ 3s² 3p¹ Orbital diagram: Code 1s ↑↓ 2s ↑↓ 2p ↑↓ ↑↓ ↑↓ 3s ↑↓ 3p ↑ c) Bromine (Br) — Atomic number: 35 Electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁵ Orbital diagram: Code 1s ↑↓ 2s ↑↓ 2p ↑↓ ↑↓ ↑↓ 3s ↑↓ 3p ↑↓ ↑↓ ↑↓ 4s ↑↓ 3d ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ 4p ↑↓ ↑ ↑