There are various basic elements from which all matter is made Everything is composed of small atoms moving in a void Some atoms are round, pointy, oily,

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Presentation transcript:

There are various basic elements from which all matter is made Everything is composed of small atoms moving in a void Some atoms are round, pointy, oily, have hooks, etc. to account for their properties Ideas rejected by leading philosophers because void = no existence

Introduced his ideas in 1803 Each element is composed of extremely small particles called atoms All the atoms of a given element are identical, but they differ from those of any other element Atoms are neither created nor destroyed in any chemical reaction

Discovered electron 1897 – Cathode Ray Experiment Plum Pudding / Chocolate Chip cookie dough model 1904 Electrons in a soup of positive charges Discovered isotopes 1913

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Nucleus Theory 1910 alpha particle gold foil experiment An atom’s mass is mostly in the nucleus The nucleus has a positive charge Electrons in fixed orbit

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Planetary Model 1913 Nucleus surrounded by orbiting electrons at different energy levels Electrons have definite orbits Worked on the Manhattan Project (US atomic bomb)

Brain Pop