Early Atomic Theory and Structure. Chapter 5. What are the building blocks of matter?. Early Greeks Air, Earth, Water, Fire Democritus (470-370 BC) Atoms John Dalton (1766-1844) Modern Atomic Theory. Dalton’s Atomic Theory.
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Law of Multiple Proportions
Both explained by Dalton’s Law.
Atomic Number = Z = number of protons in an atom. = number of electrons in a neutral atom. Mass Number = number protons + number neutrons in an atom
The precious metal platinum (Z=78) has six isotopes with these abundances:
Use these data to calculate the average atomic mass of platinum.