⚛️ Atoms and molecules
Atom builder
Protons, neutrons and electron shells for elements 1–10.
Atom builder
💬 Questions and answers
1What am I looking at?
Answer: A simplified (Bohr) model of an atom for elements 1 to 10.
2What are its parts? (click a part to identify it)
Answer: Nucleus with protons and neutrons, and electrons arranged in shells.
3How does it work?
Answer: Protons (+) and neutrons sit in the nucleus; electrons (−) occupy shells, the first holding up to 2 and the second up to 8.
4Why is it important?
Answer: Electron arrangement decides how an element reacts and forms bonds.
5What happens if I change something? (use the sliders)
Answer: Pick an element: the numbers of particles and the shell arrangement update.
6What should I remember for the exam?
Answer: Atomic number = protons; mass number = protons + neutrons. Shell capacity 2n² (2, 8, 18). Carbon (Z = 6) is 2, 4.