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Notes: Atoms. Atoms are the smallest particles of an element. Every atom is made of three parts: Protons – Positive charge Neutrons – No charge (neutral) Electrons – Negative charge. Protons and neutrons are found in the nucleus of an atom and both have an atomic mass of 1

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  • Atoms are the smallest particles of an element.

  • Every atom is made of three parts:

    • Protons – Positive charge

    • Neutrons – No charge (neutral)

    • Electrons – Negative charge



  • Atomic number both have an atomic mass of 1 – the number of protons in the nucleus

  • Every atom of a particular element contains the same number of protons

  • Atomic mass – the number of protons plus the number of neutrons


Dalton s atomic theory
Dalton’s Atomic Theory both have an atomic mass of 1

  • Atoms can’t be broken down into smaller pieces

  • In any element, all the atoms are exactly alike

  • Atoms of two of more elements can combine to form compounds



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