Unit 3 Exam Review

Who used electricity a cathode ray tube and magnets to discover the electron?

• J.J. Thompson
• Dalton
• Rutherford
• Schrödinger

Which experiment provided strong evidence for the existence of the nucleus?

• Cathode ray tube & magnets
• Gold foil & alpha particle experiment
• Alloy Smelting Demonstration
• X-ray diffraction column experiment

Which Greek philosopher was the first to propose the idea of an atom?

• Bohr
• Aristotle
• Democritus
• Plato

Which of the following subatomic particles has a negative charge?

• Proton
• Neutron
• Quark
• Electron

Which of the following subatomic particles has a mass of 1 amu (atomic mass unit)

• Electrons
• Proton
• Nucleus
• Orbital

How many electrons is the maximum that the first shell of any element hold?

• 2
• 8
• 18
• 7

As shown in the image, what is 282.857?

• Atomic number
• Average atomic mass
• Mass number
• Number of neutrons

If Unobtanium was real how many neutrons would it have?

• 282
• 142
• 140
• 141

This is a Bohr Model for which element?

• Nitrogen
• Carbon
• Boron
• Silicon

Which particle DOES NOT contribute to significantly contribute to the overall mass of an atom?

• Protons
• Quarks
• Electrons
• Neutrons