Gr 9_Development of the model of the atom

Who proposed the idea that everything is made up from tiny little particles that can't be broken down any further?

• Democritus

• Ernest Rutherford

• Niels Bohr

• John Dalton

Which scientist described atoms as solid spheres and suggested that different types of spheres might make up the different elements?

• Democritus

• Niels Bohr

• John Dalton

• J.J. Thompson

Who came up with the plum pudding model of the atom, suggesting that it was a general ball of positive charge with discrete electrons stuck in it?

• J.J. Thompson

• Niels Bohr

• John Dalton

• Ernest Rutherford

What did Ernest Rutherford and his students discover in their experiments with alpha particles and a thin sheet of gold?

• The alpha particles caused the gold sheet to disintegrate

• The alpha particles were absorbed by the gold sheet

• The alpha particles were deflected to the side

• The alpha particles passed right through the gold sheet

What did Rutherford's nuclear model propose about the structure of the atom?

• The atom had a compact nucleus containing all the positive charge

• The atom was a solid sphere with a cloud of negative charge around it

• The atom was a general ball of positive charge with discrete electrons stuck in it

• The atom had a cloud of negative electrons surrounding a positive nucleus

What was the flaw in Rutherford's nuclear model of the atom?

• The model did not account for the existence of electrons

• The model did not explain the presence of protons

• The model did not prevent the collapse of the atom

• The model did not include the concept of neutrons

Who suggested that the electrons orbited the nucleus in a similar way to how the planets orbit the sun?

• Ernest Rutherford

• Niels Bohr

• John Dalton

• J.J. Thompson

What did James Chadwick provide evidence for in the nucleus of the atom?

• Electromagnetic waves

• Neutral particles

• Positively charged particles

• Negatively charged particles

What did John Dalton describe atoms as?

• Plum pudding

• Nuclear models

• Solid spheres

• Tiny particles

What did J.J. Thompson's experiments show about the structure of the atom?

• The atoms had a compact nucleus

• The atoms were made up of tiny particles

• The atoms contained negatively charged particles

• The atoms were solid spheres