Atomic Structure

Atomic structure describes how a tiny, dense nucleus of protons and neutrons is surrounded by electrons arranged in shells and orbitals. Understanding this arrangement explains the periodic table, chemical bonding, and t…

• Atom: nucleus (protons + neutrons) surrounded by electrons.
• Proton charge +1, neutron 0, electron −1.
• Atomic number (Z) = number of protons; defines the element.

Full explanation, worked examples & memory tricks in the app