Cheat Sheet — INC-01 Quick Reference (Pinned) — Notes

$\boxed{\text{Properties of elements} \propto f(\text{atomic number}) \quad \text{— Moseley, 1913}}$

$\boxed{IE(\text{Be}) = 899 > IE(\text{B}) = 800 \quad \text{(filled 2s}^2 \text{ vs 2p}^1\text{)}}$

$\boxed{IE(\text{N}) = 1402 > IE(\text{O}) = 1314 \quad \text{(half-filled 2p}^3 \text{ stability)}}$

$\boxed{EGE(\text{Cl}) = -349 < EGE(\text{F}) = -328 \quad \text{(F 2p repulsion)}}$

(Note: more negative = Cl wins the EGE competition)

$\text{N}^{3-}\ (146) > \text{O}^{2-}\ (140) > \text{F}^-\ (133) > \text{Na}^+\ (98) > \text{Mg}^{2+}\ (66) > \text{Al}^{3+}\ (51)\ \text{pm}$

More protons on same 10 electrons = smaller radius

Pair	Shared Behavior
Li–Mg	Normal oxides; carbonates decompose on heat; weak base hydroxides
Be–Al	Amphoteric oxides; covalent chlorides; dissolve in NaOH; max covalency = 4
B–Si	Acidic oxides; covalent hydrides; chlorides hydrolyzed by water

Fact	Value
EN of F	4.0 (Pauling) — highest
EGE of Cl	−349 kJ/mol — most negative among halogens
$IE_{1}$ of N	1402 kJ/mol
$IE_{1}$ of Be	899 kJ/mol
Noble gas EGE	Positive (energy input needed)

Isoelectronic order: "No One Finds Naughty Magicians Alive" → $N^{3-}$ > $O^{2-}$ > $F^{-}$ > $Na^{+}$ > $Mg^{2+}$ > $Al^{3+}$
IE exceptions: "BeNd Before Nothing Overflows" → Be > B; N > O
EGE anomaly: "Chlorine Catches; Fluorine Frustrated" → Cl > F in EGE
Blocks: "Students Pass Difficult Finals" → s, p, d, f