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Inside the Atom

Inside the Atom

Every atom is constructed from three fundamental subatomic particles: protons, neutrons, and electrons. Protons and neutrons reside in the tiny, dense core known as the nucleus, which holds almost all the atom's mass. Electrons orbit the nucleus in the space surrounding it.

Atomic structure and isotopes Lesson

  1. A Level
  2. /Chemistry
  3. /Atomic structure and isotopes

Step-by-step lessons on OCR A A Level Chemistry Atomic structure and isotopes. Each one builds up to exam-style questions. Build confidence with atomic structure, bonding and moles calculations early on, since these underpin the more demanding organic mechanisms, equilibrium and practical-analysis topics that dominate Year 2.

Lessons