Question

CHEMISTRY
#
write about any 3 scientists and their contributions to the structure of atom


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Answer 1

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Democritus

Greek Philosopher 460-370 BC

Proposed the existence of atoms

He said that atoms were small particles that varied in shape and size.

John Dalton

PROPOSED ATOMIC THEORY 1808

+ atoms were a tiny hard sphere.

Joseph John Thomson

1868 - made observations with cathode ray tube. identified the electron. said that the nucleus has electrons embedded in it to give charge. cookie dough model.

Ernest Rutherford

1911 - gold foil experiment. deferred that atoms made of mostly empty space. positively charged nucleus electrons surrounded nucleus. said that nucleus held majority of mass.

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Answer 2

1.Earl Rutherford

Contribution-He theorized that atoms have their charged focus in a very small necleus.

2.Neils Bohr

Contribution-Bohr developed the Bohr model(shows the atom as small with a positively charge surrounded by)

3.JJ Thompson

Contribution-He determined that hydrogen had only one electron per atom.

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