F321 Atomic structure notes

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Chemistry F321 NOTES
UNIT F321 REVISION CHECKLIST (OCR `AS' CHEMISTRY)
Atomic Structure
The nucleus contains protons (positively charged) and neutrons (neutrally charged).
The atomic number (proton number) is equal to the number of protons in the atom's nucleus and
the amount of electrons orbiting the nucleus
The mass number is the total number of protons and neutrons in the nucleus.
Ions do not have the same number of electrons as protons, and so have an overall charge.
Name Relative charge Relative mass
proton +1 1
neutron 0 1

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Chemistry F321 NOTES
Electron -1 1/2000
Isotopes and Relative Masses
Isotopes are atoms that have the same number of protons but a different number of neutrons.
The relative atomic mass is the weighted mean mass of an atom of an element relative to C12.
The relative formula mass of a compound is equal to the sum of the individual relative atomic
masses.
How to calculate an isotopes relative atomic mass...…read more

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