Atomic Structure

Atomic Structure

1. Inside Atoms

   • What are atoms made up of?
     • Nucleus
       • Protons and neutrons are tightly packed together in the centre of the atom
       • Protons
         • Symbol: p Relative charge: +1 Relative mass: 1
       • Neutrons
         • Symbol: n Relative charge: 0 Relative mass: 1
     • Electrons
       • Symbol: e Relative charge: -1 Relative mass: 1/1840

2. The Proton Number and Nucleon Number

   • The Proton Number and Nucleon Number
   • Proton number (Z)
     • number of protons
   • Nucleon number (A)
     • number of protons + number of neutrons (number of neutrons = A - Z)
   • Representing the proton and nucleon numbers

3. Isotopes

   • atoms of the same element with the same number of protons and electrons, but with different numbers of neutrons
   • The Proton Number and Nucleon Number

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