Atomic structure

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  • Atomic Structure
    • Protons, Neutrons and Electrons
      • An atom has the same number of protons as electrons.
      • Protons have have a positive charge.
      • Electrons have a negative charge
      • A proton nearly has the same mass as a neutron.
      • The nucleus is made up of protons and neutrons
    • Isotopes
      • Isotopes of the same element have different masses, the same number of protons and electrons; different numbers of neutrons in the nucleus.
      • Different isotopes of the same element react in the same way because chemical reactions involve electrons and neutrons make no different to electrical activity.
    • Atomic Structure of Ions
      • Many atoms react by gaining or losing an electron to form ions
      • Ions are charged because they have different number of electrons and protons
    • Key Words: Proton, Neutron, Electron, Isotope, Atomic Number, Mass number Ions
      • Isotopes are atoms of the same element with different numbers of neutrons.
      • Atomic number is the number of protons in the nucleus of an atom.
      • Mass number is the number of particles in the nucleus.
      • An ion is a positively or negatively charged atom or group of atoms.


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