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C2S, image Elements Since the dawn of humanity, humans have wondered if…

- - - - Valenece Shell
        electron shells
      - Ions
    - - Neutrons
        isotopes
      - Protons
- - - - Boron [B]
        semimetal proprieties
      - Silicon [Si]
        semimetals and technology
      - Polonium [Po]
        radioactivity
      - Arsenic [As]
        dangerous elements
    - - Hydrogen [H]
        special traits
      - Helium [He]
        noble gases
      - Carbon [C]
        importance to life
      - Nitrogen [N]
        non-metal proprieties
      - Oxygen [O]
        covalent bonds
      - Phosphorus [P]
        elemet discovery
      - Fluorine [F]
        halogen proprieties
      - Oganesson [Og]
        last element
      - Chlorine [Cl]
        ionic bonds
      - Sulphur [S]
        Allotropes
    - - Sodium [Na]
        ionic bonds
      - Copper [Cu]
        earliest element
      - Iron [Fe]
        mettalic bonds
      - Mercury [Hg]
        high (low) melting and boiling point
      - Calcium [Ca]
        metals and biology
      - Gold [Au]
        valuable metals
      - Lead [Pb]
        heavy metals and health
      - Technetium [Tc]
        radioactive decay
      - Lithuim [Li]
        alkali metal proprieties
      - Scandium [Sc]
        predicting proprieties
      - Uranium [U]
        f block