Atomic Structure

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  • Atomic Structure
    • Atoms
      • The Nucleus
        • The nucleus is in the middle of the atom and it contains protons and neutrons.
        • It has a positive charge because of the Protons.
        • Almost the whole mass of the atom is concentrated in the nucleus.
      • The Electrons
        • Electrons move around the nucleus in electron shells.
        • They are negatively charged and have virtually no mass.
      • Atoms have no charge because they have the same amount of electrons and protons.
    • Electronic structure
      • Electrons always occupy shells, which surround the nucleus.
      • The shells that are closest to the nucleus are always filled first and only a certain amount of electrons are allowed on each shell.
    • Compounds
      • When elements react, atoms combine with other atoms to form compounds. Compounds are substances formed from 2 or more elements.
      • Compounds can be represented by formulas. For example, Carbon Dioxide is CO2- 1 carbon atom and 2 oxygen atoms.
    • Elements
      • Elements consist of atoms with the same atomic number.
    • Atomic and Mass Number
      • The atomic number tells you how many protons and electrons there are and the mass number tells you the total number of neutrons and protons in the atom.
      • The mass number is above the symbol and the atomic number is below.
      • To get the number of neutrons, just subtract the atomic number from the mass number.

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