BRAINCAKEThe Nuclear Atom.
An atom consists of a nucleus which contains two types of subatomic particles - protons and neutrons. Electrons - a further type of subatomic particle - occupy a region in space outside the nucleus and are arranged in shells.
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Key terms in this lesson
- Electron shell
- A main energy level occupied by electrons, given a principal quantum number n, with n = 1 closest to and lowest in energy relative to the nucleus.
More in Atoms, Ions and Compounds
- Atomic Number
- Isotopes
- Ions
- Carbon-12
- Relative Isotopic Mass
- Relative Atomic Mass
- The Mass Spectrometer
- Calculating Relative Atomic Mass
All 17 lessons in Atoms, Ions and Compounds · All OCR AS-level Chemistry topics