Chapter 2 Lesson 1

What is at the center of every atom?

• An electron
• A compound
• A molecule
• A nucleus

Which two particles make up the nucleus of an atom?

• Protons and Electrons
• Protons and Neutrons
• Molecules and Compounds
• Neutrons and Electrons

The particles with no charge in an atom are the _______.

• electrons
• neutrons
• protons
• protons and neutrons

The positively charged particles of an atom are the ________.

• electrons
• protons
• neutrons
• protons & neutrons

The negatively charged particles of an atom are the ______.

• electrons
• protons
• neutrons
• protons & neutrons

Which of the following scientists added negatively-charged particles to the model of the atom?

• Niels Bohr
• John Dalton
• Ernest Rutherford
• J. J. Thomson

How was the Thomson model different from the Bohr model that followed it?

• The Bohr model did not include positive charges in the atom.
• The Bohr model showed electrons surrounding the positive nucleus.
• The Bohr model consisted of a single, solid mass with no smaller particles.
• The Bohr model showed neutrons in a cloud surrounding the negative nucleus.

Who coined the term the atom?

• Democritus
• Dalton
• Bohr
• Thomson

Who discovered the electron?

• Dalton
• Bohr
• Thomson
• Rutherford

Who discovered a positively charged particle in the center of the atom?

• Bohr
• Thomson
• Dalton
• Rutherford