3D ATLAS / MATTER & QUANTUM / INNER WORLD 01

Go smaller.
Lose the familiar.

One atom. One electron described by probability. A nucleus hidden by scale. Enter the model, then open the measurements that give it meaning.

HYDROGEN / 1s PROBABILITY

Choose a view. Drag to rotate; pinch or use the zoom buttons.

FILE 01 / INNER WORLDS

The Electron Cloud

Hydrogen / one electron / 1s state

Where is the electron?

The cloud samples the probability distribution for the ground-state electron in an idealized hydrogen atom. Brighter, denser regions represent positions where a measurement is more likely to find it. Thousands of dots in the scene stand for possible outcomes of one electron, not thousands of electrons and not a filmed trajectory. The nucleus is drawn far larger than its true proportion so it remains visible.

Read The Mountain Hiding Inside Every Atom NIST: Hydrogen ground state NIST: Electron probability distribution

FILE 02 / INNER WORLDS

The Hidden Scale

A deliberate change of magnification

Why does the nucleus vanish in an honest atom-sized view?

The nucleus contains almost all the mass of an atom while occupying a tiny fraction of its extent. The model changes magnification to inspect it. The transition between these views is a change of scale, not a continuous camera move through an accurately sized proton and electron cloud. The glowing boundary is visual language for the cut between views.

Read the illustrated atom article NIST: Atomic spectra and states

FILE 03 / INNER WORLDS

The Thorium Clock

Thorium-229 / nuclear energy transition

Can a change inside a nucleus keep time?

Thorium-229 has a nuclear transition that can be addressed with ultraviolet light. Clock research compares a laser frequency with this exceptionally narrow resonance. Here, amber and blue beads count 90 protons and 139 neutrons, but their packed arrangement is only a schematic; it is not an image of a thorium nucleus or its quantum state. The brief glow illustrates a transition and does not depict a visible flash from the laboratory.

Open the nuclear-clock Evidence File Read the illustrated nuclear-clock article NIST: Nuclear clocks

THE COUNTERPART / INNER WORLD 06

From atom to antiatom

Start with the hydrogen model above. Its nucleus contains a positively charged proton, and a negatively charged electron is bound to it. Antihydrogen replaces both constituents with their antiparticles: a negatively charged antiproton and a positively charged positron. Both complete atoms have no net electric charge.

MATTER / HYDROGENProton electron

One ordinary hydrogen atom in the 3D probability-cloud model above.

ANTIMATTER / ANTIHYDROGENAntiproton positron

The corresponding neutral antiatom assembled from two charged antiparticles.

This change makes containment a different problem. Electric and magnetic fields can confine the charged antiprotons and positrons before they combine. The finished neutral antihydrogen must be kept from the chamber wall with a specially shaped magnetic field. The atom model above is not an image of either laboratory trap.

Enter the chamber to watch those stages in sequence, then follow the ALPHA-g release experiment that tested which way antihydrogen falls.

Enter the Antimatter Containment Chamber Examine the gravity evidence

ANOTHER LABORATORY / INNER WORLD 08

Read the tracks after a collision.

Compare a bound atomic electron with a high-energy electron tracked through a collider. Explore how charge, showers, and detector layers reveal different particles.

Enter the Particle Collision Chamber

ABOUT THESE VIEWS

The hydrogen cloud uses random samples of the normalized radial probability distribution for a 1s state, with uniform directions. It is an idealized mathematical model, not measured coordinates of an electron. The nucleus is exaggerated in the atom view, and the enlarged thorium-229 cluster uses an illustrative packing of correctly counted nucleons. The model does not show orbiting electrons, a true cross-section of a nucleus, or the spatial structure of a nuclear transition.

Sources: NIST’s hydrogen ground state, NIST’s probability distribution illustration, and NIST’s nuclear-clock explanation.

SCALE LAB / THREE USEFUL COMPARISONS

Make the distance
mean something.

Compare black-hole horizons, calculate a signal’s travel time, and zoom from a cell toward an atom. Every tool shows its working and the assumptions behind its answer.

Open Scale Lab

SCIENTIFIC INQUIRY / APPLIED HERE

Explore all twelve principles

09 Model scope and predictions

A probability cloud is not a tiny planetary system.

The view represents a selected atomic state and deliberately changes scale to reveal the nucleus. Treat the cloud as a way to discuss probability, not a filmed electron trajectory. Ask which assumptions define the state before generalizing to other atoms.

Ask yourself Which assumptions drive this result, and where would the model stop being useful?