C1 Fundamental ideas

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Atomic structure

  • The nucleus of an atom is made of protons and neutrons.
  • Protons have a positive charge, electrons a negative charge and neutrons not charged.
  • The atomic number(or proton number) of an element is equal to number of protons in the nucleus of its atoms.
  • Elements are arranged in order of their atomic numbers in the periodic table.
  • The mass number is the sum of the protons and neutrons in the nucleus of an atom

The arrangement of electrons in atoms

  • The atoms of the unreactive noble gases


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