Synthesizing atomic coordinates…
A4 & US Letter Study Guides
Each reference sheet is typeset for clean black-and-white or color classroom printing with summary tables, worked examples, and common exam pitfalls.
A printable guide to atomic radius, ionization energy and electronegativity, with the reasoning behind the patterns and key exceptions.
Worked example:
Largest to smallest: O²⁻ > F⁻ > Na⁺ > Mg²⁺. Each ion has 10 electrons; their proton counts increase from 8 to 9 to 11 to 12.
Print common monatomic and polyatomic ion formulas, charge-balancing examples, and the distinction between ionic charge and oxidation state.
Worked example:
Al³⁺ + SO₄²⁻: two aluminium ions give +6 and three sulfate ions give −6, so the neutral formula is Al₂(SO₄)₃.
A printable electron-configuration guide with subshell capacities, filling order, noble-gas cores, orbital rules, and common exceptions.
Worked example:
Fe: [Ar] 3d⁶ 4s². Remove the two 4s electrons for Fe²⁺ → [Ar] 3d⁶. Remove one more 3d electron for Fe³⁺ → [Ar] 3d⁵ (23 electrons).