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An uncharged subatomic particle found in the nucleus, with relative charge 0 and relative mass 1.

An uncharged particle found in an atom’s nucleus.

The nucleus contains positively charged protons and uncharged neutrons, so it is positively charged overall. Negatively charged electrons are found around it. Although diagrams often show a large, clearly drawn nucleus, they cannot usually show the real sizes to scale.

An electrically neutral particle found in an atomic nucleus, with approximately the same mass as a proton.

Keep the chronology clear: electron discovered in 1897 → plum pudding model proposed later → alpha scattering and nuclear model → Bohr’s fixed distances → proton → Chadwick’s neutron.

Do not apply the required alpha–beta–gamma ordering automatically to neutrons; AQA limits this comparison of penetration, range and ionising power to alpha, beta and gamma.

If asked where most of an atom’s mass is found, state in the nucleus and explain that protons and neutrons each have a relative mass of about 1, whereas an electron’s relative mass is very small.

An uncharged particle found in atomic nuclei and sometimes emitted during nuclear processes.

The nucleus contains two kinds of particle: positively charged protons and uncharged neutrons.

An uncharged sub-atomic particle with relative mass 1, found in an atomic nucleus.

A neutral particle found in an atomic nucleus; a neutron can be absorbed by U-235 and can also be emitted during fission.

An uncharged subatomic particle found in the nucleus, with a relative mass of 1 and a relative charge of 0.

A subatomic particle in the nucleus that has no electric charge.

The nucleus contains protons, which are positively charged, and neutrons, which have no charge. This is why the nucleus is positively charged. Each electron has a negative charge.

A particle in an atomic nucleus with no electric charge.

A particle in the nucleus with no electrical charge and a relative mass of 1.

An uncharged subatomic particle found in the nucleus.

The nucleus contains positively charged protons and uncharged neutrons, so it has an overall positive charge. Negatively charged electrons surround it at different energy levels, often called shells.

Neutron

Definition

How each exam board covers it

AQA GCSE Physics · 8463

Exam tips

Revise Physics with GradeGen

Edexcel GCSE Physics · 1PH0

OCR GCSE Physics A · J249

OCR GCSE Physics B · J259