Subatomic particles

• Subatomic particles


  Fundamental particles that make up atoms
• Subatomic particles

  • Proton
  • Neutron
  • Electron
• Proton

  • Relative charge: +1
  • Relative mass: Approximately 1 atomic mass unit (amu) or 1.6726 x 10^-27 kg
• Neutron


  • Relative charge: 0 (neutral)
  • Relative mass: Approximately 1 atomic mass unit (amu) or 1.6749 x 10^-27 kg
• Electron

  • Relative charge: -1
  • Relative mass: Approximately 1/1836 amu or 9.11 x 10^-31 kg
• Charge Neutrality

  Atoms are electrically neutral because the number of protons (positively charged) in the nucleus is equal to the number of electrons (negatively charged) in the electron cloud
• Radioisotopes

  Different isotopes of the same element have the same number of protons in their atomic nuclei but differing numbers of neutrons. Some isotopes of an element are unstable and show radioactive decay.
• Radioisotopes

  • hydrogen-3(protium)
  • carbon-14
  • uranium-238