Chemistry · Chapter 2

Atom Builder

Add and remove the three particles and see what you have made. Protons set the element. Neutrons set the isotope. Electrons set the charge.

The atom you built nucleus in the middle, electrons in shells

The atom you built

The shells are a simple sketch, not a photograph. Electrons really move through a cloud of space. The sketch is still useful, because the outer count is what drives the chemistry.

What you have

Nothing yet empty
Add a proton to begin With no protons there is no element.
Atomic number Z
0
Mass number A
0
Net charge
0
Parts added up (u)
0.000

Full symbol will appear here.

Controls

Protons 0
Neutrons 0
Electrons 0
Jump to a known particle
Start here
An empty nucleus
Press + proton and the element appears at once. One proton is hydrogen. Six is carbon. The proton count is the whole identity of an element.