History of Atoms

Whose model suggested that negative particles were mixed in with positively charged material - like seeds in a watermelon?

• J.J. Thomson

• Ernest Rutherford

• Niels Bohr

• Albert Einstein

Which scientist proposed a new atomic model after discovering the electron in 1897?

• Dalton

• Thomson

• Rutherford

• Bohr

Which experiment discovered the nucleus of the atom?

• cathode ray tube

• gold foil experiment

• heisenberg's uncertainty principle

• flame test experiment

Democritus believed that the smallest particles, were atomos, the Greek word for 

• small

• uncut or indivisible

• basic

Who is known as the father of modern atomic theory?

• John Dalton

• Niels Bohr

• Albert Einstein

• Isaac Newton

Which model of the atom was proposed by J.J. Thomson?

• Plum pudding model

• Nuclear model

• Planetary model

• Quantum model

What did Rutherford's gold foil experiment demonstrate about the structure of the atom?

• Atoms are solid spheres

• Atoms have a dense nucleus

• Electrons orbit the nucleus in fixed paths

• Atoms are indivisible

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Which scientist is credited with the discovery of the neutron?

• James Chadwick

• Ernest Rutherford

• Niels Bohr

• J.J. Thomson

What is the main idea of Bohr's model of the atom?

• Electrons orbit the nucleus in fixed paths

• Atoms are indivisible

• Atoms are solid spheres

• Atoms have no internal structure

Which ancient philosopher first proposed the idea of the atom as an indivisible particle?

• Democritus

• Aristotle

• Plato

• Socrates