Review Unit 01 Atomic Structure & Theory

Which of the following statements are true about Thomson's discovery of electron properties?

Select TWO correct answers.

• His experiment showed all atoms have negatively charged particles.

• He used gold foil to prove electrons are positive.

• The mass of the proton was measured as part of his experiment.

• His experiment focused only on neutrons and neutrinos.

• He used a plum pudding model to demonstrate the structure of an atom.

What conclusions were drawn from Ernest Rutherford's gold foil experiment?

Select TWO correct answers.

• Atoms are hard spheres.

• Atoms are mostly empty space.

• Atoms have the same mass but different volumes.

• Atoms have the same mass and volume.

• Atoms have a dense, positively charged nucleus.

Niels Bohr published a theory about atomic structure. Bohr's

theory suggested that —

• electrons are found only in certain energy levels

• protons have a positive charge

• protons and neutrons are found in a large central nucleus

• neutrons surround the nucleus

This chemist said:

• 
  all substances are made of atoms that cannot be created, divided, or destroyed

• 
  atoms join with other atoms to make new substances

• 
  atoms of the same element are exactly alike, and atoms of different elements are different in mass and size (elements)

• J.J. Thomson

• John Dalton

• Ernest Rutherford

• Neils Bohr

Which area of the diagram shows an electron occupying the lowest energy level outside the nucleus of an atom?

• 1

• 2

• 3

• 4

Answer explanation

Energy levels near the nucleus are lower, while the furthest away has the most energy

Which particle would likely represent a neutron?

• red

• green

• yellow

Answer explanation

neutrons have no charge

Which particle has the least mass?

• proton

• neutron

• electron

Which particle has a neutral charge?

• proton

• neutron

• electron

Which particle is found outside the nucleus?

• proton

• neutron

• electron

Which particle has a positive charge?

• proton

• neutron

• electron