Chemistry (AS Level)·Atomic structure · NSSCAS 1.2.1–1.2.2
Sub-atomic particles, the nucleus & isotopes
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Inside every atom are three particles that decide its identity and behaviour. Learn the relative charges and masses of protons, neutrons and electrons, how mass and charge are distributed, how they deflect in an electric field, and how to deduce the make-up of any atom or ion — including isotopes.
What you'll learn in this lesson
By the end you should be able to (NSSCAS Chemistry (AS Level) 1.2.1–1.2.2):
- Identify and describe protons, neutrons and electrons in terms of relative charges and relative masses
- Describe the distribution of mass and charge within an atom, and the behaviour of the particles in an electric field
- Deduce the numbers of protons, neutrons and electrons in atoms and ions from proton number, nucleon number and charge
- Describe proton (atomic) number and nucleon (mass) number; distinguish isotopes; use the ᴬZX symbolism
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