Atoms

• Name the particles that are found in the nucleus of an atom

  Protons and neutrons
• What is the charge of a proton?

  Positive 1, or +1
• What is the charge of a neutron?

  Neutral, or 0
• What is the charge of an electron?

  Negative 1, or -1
• What is the relative mass of a proton?

  1
• What is the relative mass of a neutron?

  1
• What is the relative mass of an electron?

  0
• What is the overall charge of an atom?

  Neutral, or 0
• Why do atoms have a neutral charge?

  Because they have the same number of positive protons and negative electrons, so the charges cancel out
• What does the 'atomic number' of an atom tell you?

  The number of protons the atom has
• What does the 'mass number' of an atom tell you?

  The total number of protons and neutrons the atom has
• How can you use the atomic number and mass number of a given atom to work out how many neutrons it has?

  number of neutrons = mass number - atomic number