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GCSE Physics · key term
The number of protons in the nucleus of an atom; it identifies the element.
Used by AQA, Edexcel and OCR
Specification 4.4.1.2, 4.4.2.2 · Paper 1
Revise: Mass number, atomic number and isotopesBecause their proton numbers are equal, their atomic numbers and elemental identities are the same. Their neutron numbers—and therefore their mass numbers—are different.
The number of protons in a nucleus, written at the lower left of a nuclide symbol; it determines the element.
Specification 6.4, 6.6, 6.18, 6.19, 6.22, 6.38P · Paper 1
The number of protons in an atomic nucleus; it identifies the element.
Revise: Nucleus CharacteristicsThe number of protons in a nucleus is its atomic number, also called its proton number. It determines which element the atom belongs to. A change in proton number would therefore produce a different element.
The number of protons in the nucleus of an atom.
The number of protons in a nucleus; it determines which element the atom is.
The number of protons in a nucleus, written at the lower left of a nuclide symbol; it determines the element and represents the nuclear charge in balancing.
The number of protons in a nucleus, which identifies its element.
Specification P6.1a, P6.1b, P6.1c, P6.1f, P6.1g · Paper 2 (Foundation), Paper 4 (Higher)
The number of protons in the nucleus of an atom; this number identifies the element.
Revise: Nucleus compositionThe periodic table is arranged by atomic number, so it can be used to connect an element's identity with the number of protons in its nucleus.
The number of protons in an atom's nucleus; it determines which element the atom is.
The number of protons in a nucleus; it determines which element the atom belongs to.
The number of protons in a nucleus; it identifies the element and is the lower number, , in a nuclear symbol.
A number equal to the number of protons in a nucleus, written at the lower left of a nuclide symbol; it identifies the element.
Use the atomic number, not the mass number, to identify an element.
Calculate neutrons using mass number minus atomic number. Do not include electrons in the mass number.
In beta decay, the daughter nucleus has atomic number , not . The emitted electron contributes on the right-hand side.
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