Atomic structure: Chemistry AQA: GCSE (9:1)
Relative mass of a proton 1 Relative mass of a neutron about the same as that of a proton Relative mass of an electron 1/1840 Relative charge of a proton +1 Relative charge of a neutron 0 Relative charge of an electron -1 Neutral atoms same number of positive protons as negative electrons
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atomic structure chemistry aqa gcse 91
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