Atomic Structures - Subatomic Particles

Atomic Structures - Subatomic Particles

1. Protons

   • Relative mass = 1
   • Positive charge
   • in nucleus

2. Neutrons

   • No charge
   • Relative mass = 1
   • in nucleus

3. Electrons

   • Negative charge
   • Relative mass = 0
   • in shells/orbitals surrounding nucleus

4. Relative atomic mass = number of electrons + number of neutrons

5. Different kinds of atoms (different by their masses) within an element, isotopes, but these have the same properties.

6. ·

   • Smaller number = atomic number = number of protons
     • = number of electrons so atom has no overall charge
       • if atoms of an element gain or lose electrons, they form IONS
   • Li = element symbol
   • Larger number = relative atomic mass

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