Atoms

• Where is the nucleus found in the atom?


  In the middle
• What does the nucleus contain?


  Protons and neutrons
• What is the radius of the nucleus?


  1x10^14 m
• What charge does the nucleus have?


  Positive
• What charge do electrons have?


  Negative.
• What determines the size of an atom?


  Volume of electron orbits
• What is the electrons relative mass?


  Very small
• What charge do atoms have?


  Neutral
• Which 2 components of the atom have the same number?

  Protons and electrons.
• The charge on the electrons is the same size as the charge on the protons, but opposite- so the charges cancel out
• What is an ion


  An atom that has lost or gained electrons
• If an atom has a negative charge has it lost or gained electrons?


  Gained
• What does the nuclear symbol of an atom tell you?


  Atomic number and mass number
• What does the atomic number tell you?


  How many protons there is
• What does the mass number tell you?


  The total number of protons and neutrons
• How can you get the number of neutrons?


  Subtract the atomic number from the atomic mass.
• Isotopes are atoms with the same number of protons but different numbers of neutrons.