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  • 7 make up remaining ~4% of human body

  • Ca, P, K, S, Na, Cl,Mg

Table 2.1 Naturally Occurring Elements in the Human Body (Biology, 6th Ed., Campbell & Reece)

Atoms & Molecules - Life requires about 25 chemical elements

  • Each element has a symbol

  • examples

    • gold (Au) - from Latin word aurum

    • oxygen (O) - from English word oxygen

Atoms & Molecules - Elements can combine to form compounds

  • Elements combine to form molecules and compounds

    • element

    • molecule

    • compound

Atoms & Molecules - Elements can combine to form compounds

  • element

  • can’t be broken down

  • atoms with same atomic number

  • molecule

  • compound

Atoms & Molecules - Elements can combine to form compounds

  • element

  • molecule

  • group of atoms of same type held together

  • example

  • molecule of oxygen (O2)

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