Atoms

• What do subatomic particles determine about an atom?

  Properties and behavior
• What are the relative masses and charges of subatomic particles?

  • Proton: Relative charge = 1, Relative mass = 1
  • Neutron: Relative charge = 0, Relative mass = 1
  • Electron: Relative charge = -1, Relative mass = Negligible (1/2000)
• What is the relative charge of a proton?

  1
• What are the properties of an electron?

  • Electric charge: -1
  • Relative mass: 1/1800
  • Location: In orbit around nucleus
• What unit is used to measure the mass of subatomic particles?

  Atomic mass units
• What is the name of the outermost layer of an atom?

  Electron shell
• What is the relative mass of a neutron?

  1
• How do the masses of the main atomic particles compare?

  • Protons and neutrons have approximately the same mass
  • Electrons have a much smaller mass compared to protons and neutrons
• What are the main components of an atom?

  • Electron shell
  • Nucleus
  • Protons
  • Neutrons
• What are the properties of a neutron?

  • Electric charge: 0
  • Relative mass: 1
  • Location: Nucleus
• Why do electrons orbit around the nucleus?

  Opposite charges attract
• Where is the location of an electron within an atom?

  In orbit around nucleus
• What is the relative mass of a proton?

  1
• Electrons have a negative charge of -1

  True
• Almost all the mass of an atom comes from the protons and neutrons in its nucleus.

  True
• What is the relative mass of an electron?

  1/1800
• Which subatomic particle has a negligible mass?

  Electron
• How do the properties of protons, neutrons, and electrons differ?

  • Protons have a positive charge and a relative mass of 1
  • Neutrons have no charge and a relative mass of 1
  • Electrons have a negative charge and a very small relative mass of 1/1800
  • Protons and neutrons are located in the nucleus, while electrons orbit around the nucleus
• What is the relative charge of an electron?

  -1
• What is the relative mass of an electron?

  Negligible (1/2000)