Atomic Structure

What scientist is best known for his "Plum Pudding" model of the atom?

• J.J. Thomson

• Ernest Rutherford
• John Dalton
• Democritus

The majority of an atom's mass exists where?

• In the nucleus
• In the electron cloud
• In the space between the nucleus and the electrons
• In the neutrons

Which scientist proposed a model of the atom in which the electrons are orbiting at different levels?

• Niels Bohr
• James Chadwick
• John Dalton
• Ernest Rutherford

Who discovered a particle in the nucleus with no charge called the neutron?

• Chadwick
• Bohr
• Rutherford
• Dalton

Which of the following correctly orders the atomic models from the oldest to the most recent?

• Dalton, Thomson, Rutherford, Bohr, Modern
• Dalton, Thomson, Bohr, Modern, Rutherford
• Thomson, Dalton, Rutherford, Modern, Bohr
• Modern, Bohr, Rutherford, Thomson, Dalton

Which scientist used his gold foil experiment to show that an atom has a small, central, positively charged nucleus that contains most of the atom's mass?

• Rutherford
• Bohr
• Thomson
• Dalton

Which one of these is NOT part of John Dalton's Atomic Theory?

• A chemical reaction is a rearrangement of atoms.

• Compounds are made up of atoms in simple whole number ratios.

• All atoms of a given element are identical in mass & properties.

• Atoms contain protons, neutrons, and electrons.

Who discovered the first subatomic particle?

• JJ Thomson

• Neils Bohr

• Ernest Rutherford

• James Chadwick

Which of these best describes the nucleus of an atom?

• Very dense with a positive charge.

• Very dense with no charge.

• Not dense with no charge.

• Very dense with a negative charge.

• Not Dense with a negative charge.

Which subatomic particle was discovered last?

• proton

• neutron

• electron