⚠️ Supplement — Section 8.2Predicting Extreme Alkali Metals
You've seen Lithium fizz. Sodium skate. Potassium explode with a violet flame.
Now extrapolate. What happens when we go further down?
🔬 The Trend Explorer
Select an element to see what happens when it meets water. Feel the escalation.
🔮 "What Happens Next?" Predictor
Potassium melts at 63°C. What about Rubidium?
Caesium's melting point is 28°C. What does that mean?
Lithium floats (density 0.53). Sodium floats (0.97). Potassium floats (0.86). What about Rubidium?
Potassium reacts vigorously with lilac flames. What does Caesium do?
⚠️ SAFETY SUMMARY
Rb + Water
EXPLOSIVE. H₂ ignites immediately. Never in schools.
Cs + Air
Ignites spontaneously in air. Must be stored in sealed ampules under argon.
Cs + Water
Catastrophic detonation. Produces CsOH (caustic) + H₂ (explosive).
Cs Melting
Melts at 28°C. Body heat sufficient. Liquid Cs is extremely corrosive.
Cambridge IGCSE Chemistry 0620 · Section 8.2.2 Supplement · Limitless Professor Protocol v2.0