Atom Worldbox

Atom Worldbox is a chemistry and nuclear physics sandbox in your pocket. Drop atoms from the periodic table onto the scene, watch them bond by electronegativity, form molecules, and trigger real reactions. No fake explosions, no shortcuts, just atoms behaving the way they actually do.

🧪 REAL CHEMISTRY, REAL BONDS
• Full periodic table: dozens of elements from Hydrogen to Plutonium.
• Atoms form covalent, polar, or ionic bonds based on electronegativity difference.
• See the electron transfer animation in ionic bonds with your own eyes.
• Bonds break when stretched and atoms become free again.
• The system automatically recognizes molecules: H₂O → "Water", NaCl → "Sodium Chloride", CH₄ → "Methane".

⚗️ DOZENS OF BUILT-IN REACTIONS
• Sodium + Water → Sodium Hydroxide + Hydrogen
• Hydrogen combustion, Methane combustion
• Iron rusting, Acid-base neutralization
• Molecules in contact trigger the rule, everything is resolved in the physics engine in real time.

🌡️ TEMPERATURE & STATES OF MATTER
• Switch on Thermal Mode and every atom gets realistic thermal motion — gases finally behave like real gases instead of clumping together.
• Drag the temperature slider: cool the scene to condense gases into liquid droplets, or heat it to make them boil and fill the space.
• Phase behavior emerges on its own, with no scripted states — it all comes down to thermal energy versus attraction.
• Light gases like Helium and Hydrogen diffuse and spread out, while heavier noble gases condense first as you cool down — He < Ne < Ar < Kr < Xe, exactly like real boiling points.
• Liquid versus gas, for real: polar water molecules pull together into droplets while O₂ and N₂ drift apart.
• Push the heat to the extreme and molecules break apart; reach star-core temperatures and Helium nuclei fuse into heavier elements.
• Metals, salt crystals, and covalent networks stay solid — only extreme heat melts them. Flip Thermal Mode off anytime to compare with the classic behavior.

☢️ RADIOACTIVITY AND NUCLEAR PHYSICS
• 12 radioactive isotopes: Carbon-14, Potassium-40, Cobalt-60, Strontium-90, Iodine-131, Cesium-137, Polonium-210, Radon-222, Radium-226, Thorium-232, Uranium-238, Uranium-235, Plutonium-239.
• Natural decay: spontaneously emits α, β, or γ rays based on half-life.
• Neutron-triggered fission: hit U-235 with a neutron, watch it split and release more neutrons.
• Manage chain reactions yourself, controlled, or full atomic bomb?

⚛️ PARTICLE-MATTER INTERACTION
• Flying alpha and beta particles break bonds in their path.
• Gamma rays ionize atoms probabilistically.
• Neutrons cause fission in U-235 or get captured by Boron-10.
• Each particle type has its own visual: alpha (yellow), beta (purple zigzag), neutron (gray pulse), gamma (spinning photon).

🎮 INTUITIVE CONTROLS
• Pick an element or isotope from the side palette.
• Tap the screen, an atom appears.
• Drag, delete, or use preset molecule templates (Water droplet, NaCl crystal, Benzene ring…).
• Pinch to zoom, drag to pan.

🧠 WHY PLAY?
• A live visualization tool for high school and university chemistry students.
• An interactive classroom demo for teachers.
• A "what happens if I combine these?" experiment for curious minds.
• An ad-free, distraction-free science toy for kids.

🔬 TECHNICAL FEATURES
• Real electronegativity tables and valence electron counts.
• Canonical formula recognition (Hill system + ionic EN ordering).
• Fixed 60 Hz physics step, smooth rendering.
• Langevin thermostat + short-range (Lennard-Jones) van der Waals: temperature-driven gas, liquid, and solid behavior emerges from real thermodynamics, not a state machine.
• Spatial hash optimization keeps hundreds of atoms running smoothly in the same scene.

Atom Worldbox is more than a game, it's the most fun way to understand how atoms behave. Download it, put the periodic table in your pocket, and build your own laboratory.

Recent changes:
Minor bug fixes and improvements.