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Summary A Level Chemistry Year 1 Atomic Structure - Super condensed notes, Fantastic for formatting into flashcards £2.99   Add to cart
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Summary A Level Chemistry Year 1 Atomic Structure - Super condensed notes, Fantastic for formatting into flashcards
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A short and concise summary of the Atomic Structure topic in A Level Chemistry, that can easily be used for formatting into flashcard form. Does away with useless dribble and gets to the crucial points you need to know to answer spec questions

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  • November 15, 2023
  • 4
  • 2023/2024
  • Summary

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Section 1: Atomic Structure
Atoms
● Very small
● Mostly empty space


Particle Mass Charge

Electron Negligible -1

Proton 1 +1

Neutron 1 None


Periodic Table
● Mass number = protons and neutrons
● Number of protons = number of electrons

Isotope
● Atom with same number of protons but different number of neutrons

Development of model of atom
● John Dalton, 1800s
● JJ Thomson
○ Discovered electrons
○ Plum-pudding model
■ Ball of positive charge
■ Negative electrons
● Ernest Rutherford
○ Discovered proton
○ Alpha-particle experiment
■ Most particles not deflected = atom mostly empty space
■ Small percentage deflected through large angles = nucleus positively
charged
■ Extremely small percentage deflected back on themselves = most of mass in
centre of atom
○ Positively charged dense nucleus with electron cloud
● Niels Bohr
○ Electrons found in energy levels

Section 2: Mass Spectrometry
Relative Mass
● Relative atomic mass
○ Weighted mean mass of an atom of an element compared with 1/12 of the mass of a
carbon-12 atom
● Relative isotopic mass
○ Weighted mean mass of an isotope of an element compared with 1/12 of the mass of
a carbon-12 atom

Purpose of mass spec
● Detect mass of atoms/molecules present in sample
● Gives abundances of atoms/molecules of different mass

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