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GCSE Chemistry · key term
A negatively charged subatomic particle found outside the nucleus.
Used by AQA, Edexcel and OCR
Specification 4.1.1.4 · Paper 1, Paper 2
A negatively charged subatomic particle found around the nucleus, with a relative electrical charge of −1.
Revise: Subatomic ParticlesAn atom is not a solid, indivisible sphere: it contains smaller subatomic particles called protons, neutrons and electrons.
A negatively charged particle occupying energy levels around an atom's nucleus.
Specification 1.2, 1.3, 1.4, 1.6, 1.10, 1.23, 3.28 · Paper 1, Paper 2
A particle found in a shell around an atom’s nucleus.
Revise: Structure of an AtomAn atom is made of three kinds of smaller, or subatomic, particle: protons, neutrons and electrons. They are not spread evenly throughout it. At the centre is the nucleus, which contains the protons and neutrons.
A negatively charged subatomic particle with relative charge and a very small relative mass of approximately .
A subatomic particle surrounding the nucleus with a relative charge of −1.
A negatively charged subatomic particle found in shells around the nucleus, with a relative mass of approximately .
A negatively charged particle found outside an atom's nucleus.
A negatively charged subatomic particle transferred between species in a redox reaction.
Specification C1.2a, C1.2b, C1.2d · Paper 1 (Foundation), Paper 3 (Higher)
A negatively charged subatomic particle whose discovery showed that atoms were not indivisible solid spheres.
Revise: Evolution of the Atomic ModelThomson discovered the electron. Electrons are negatively charged and smaller than atoms, so an atom could no longer be regarded as an indivisible solid sphere. Because atoms are neutral overall, Thomson reasoned that an atom must also contain positive charge.
A negatively charged sub-atomic particle found in the region surrounding an atomic nucleus.
A negatively charged subatomic particle found around the nucleus, with relative charge −1 and a very small relative mass of about 1/2000.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A negatively charged particle found in an atom.
Revise: History of the atomic modelThomson’s work with cathode rays showed that atoms contain negatively charged particles, later called electrons. An atom could not therefore be an indivisible solid sphere. Thomson proposed the plum pudding model: electrons embedded throughout a ball of positive charge.
A negatively charged subatomic particle found in the space surrounding an atomic nucleus.
A particle found in shells around the nucleus, with relative charge and a relative mass of about .
A negatively charged subatomic particle surrounding the nucleus. Its relative mass is very small compared with that of a proton or neutron.
A negatively charged subatomic particle, represented in an equation by .
When explaining why an atom is neutral, state that it has equal numbers of protons and electrons and that their equal, opposite charges cancel. Do not refer to equal numbers of protons and neutrons.
Use the word “relative” when giving charges: proton +1, neutron 0 and electron −1.
In a nuclear-model description, place protons and neutrons in the nucleus and electrons around the nucleus.
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