PS.3a Scientists Who Discovered What The Atom is Like.

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Presentation transcript:

PS.3a Scientists Who Discovered What The Atom is Like

Dalton—1808 -atom is a rigid sphere -cannot be divided

Dalton—1808 -atom is a rigid sphere -cannot be divided Thomson discovered electron -atom is solid ball of ++ charge with electrons sprinkled through it

Rutherford—1911 -discovered proton -concluded that the atom has small positive nucleus - could not conclude about what the electrons were doing

Bohr— agreed that the atom has a nucleus -theorized that electrons move in layers called shells -theorized that electrons can move between shells

Chadwick discovered the neutron in 1936.

Modern Model of the atom -atom has a nucleus -We can only guess where an electron is at any time; so we draw an “electron cloud” around the nucleus. Chadwick discovered the neutron in 1936.