Honors Chapter 3 Test

1. Which of the following best describes the electron?

• a negatively charged subatomic particle found in the nucleus
• a negatively charged subatomic particle found outside the nucleus
• a neutral subatomic particle found in the nucleus
• a neutral subatomic particle found outside the nucleus

2. Which of the following best describes the neutron?

• a negatively charged subatomic particle found in the nucleus
• a negatively charged subatomic particle found outside the nucleus
• a neutral subatomic particle found in the nucleus
• a neutral subatomic particle found outside the nucleus

3. Which of the following best describes the proton?

• a positively charged subatomic particle found inside the nucleus
• a positively charged subatomic particle found outside the nucleus
• a neutral subatomic particle found inside the nucleus
• a negatively charged subatomic particle found outside the nucleus

4. By definition, the mass number is the

• number of protons in the nucleus of the atom
• sum of all of the subatomic particles of the atom
• sum of the protons and neutrons in the nucleus of the atom
• sum of the protons and electrons in the nucleus of the atom

5. The average atomic mass of atom is the average of the atomic masses of all of the isotopes of the atom as well as the

• number of neutrons
• relative abundance of the isotopes
• average atomic numbers of the isotopes
• average of all subatomic particles for the isotopes

6. Which man is credited with being the first to have an idea of an indivisible atom?

• John Dalton
• Aristotle
• Democritus
• Ernest Rutherford

7. Which man studied a cathode ray and found negatively charged particles flowing from a cathode to an anode, thus discovering the electron?

• JJ Thomson
• Eugene Goldstein
• Ernest Rutherford
• Robert Millikan

8. While studying a cathode ray, particles were found flowing opposite the negatively charged particles, thus discovering the what?

• nucleus
• proton
• neutron
• electron

9. What scientist is credited with the first model of a divisible atom?

• Rutherford
• Aristotle
• Democritus
• Dalton
• Thomson

10. What is known about the mass of the proton?

• the mass of the proton is so small, scientists say it is negligible
• the mass of the proton is 1/12 the mass of a carbon-12 atom
• the mass of a proton is nearly equal to the mass of an electron
• the mass of a proton is nearly equal to the mass of a neutron
• the mass of the proton is greater than both the neutron and electron