Inside an atom
Carbon-12 has 6 protons and 6 neutrons; changing the proton count would create a different element.
Begin here
Carbon-12 has 6 protons and 6 neutrons; changing the proton count would create a different element.
Connect the ideas
Carbon-12 has 6 protons and 6 neutrons; changing the proton count would create a different element.
Science becomes memorable when a definition is connected to something measurable or observable.
Quantum numbers label allowed electron states in atoms: principal, orbital angular momentum, magnetic and spin quantum numbers.
Quantum numbers label allowed electron states in atoms: principal, orbital angular momentum, magnetic and spin quantum numbers.
Electron configuration describes how electrons occupy available atomic states. This arrangement is central to periodic trends and helps explain why elements in the same group often react in related ways.
Concrete checkpoint
Start with the nucleus, then move outward. Protons identify the element; electrons occupy quantum states rather than miniature planetary tracks. Electron configuration is the bridge from atomic structure to chemistry.
Continue deeper
Reference spine
IUPAC · CIAAW 2024 · NIST · BIPM SI Brochure