Atoms

• What is the charge on a proton?

  Positive
• What particle determines what element an atom is?

  proton
• What particles within an atom have a relative mass of 1?

  Protons

  Neutrons
• Which of the following make up the nucleus of an atom?

  Neutron

  Electron
• Which sub-atomic particle does NOT have a charge?

  Neutron
• What do we call an atom that has a positive or negative charge?


  An Ion
• What is the charge on an electron?


  Negative (-1)
• What do electrons orbit in?

  Electrons orbit the nucleus in energy shells
• If an atom has 6 protons and 5 electrons, what charge will it have overall?

  It has 6 positive protons (+6) and 5 negative electrons (-5). So must have a +1 charge overall
• What is the relative mass of a proton?

  1
• What does the 'mass number' of an atom tell you?

  The total number of protons + 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
• What is the relative mass of an electron?

   0, 1/2000, or 'negligible
• What is the charge of a neutron?

  Neutral, or 0.
• What does the 'atomic number' of an atom tell you?

  The number of protons the atom has.

  (it also tells you the number of electrons it has, but only if it is a neutral atom if the atom has a charge, it's an ion, and the atomic number won't tell you the number of electrons)
• What is the relative mass of a neutron?

  1
• What is the overall charge of an atom?

  Neutral, or 0

  if an atom does have a positive or negative charge - it's not an atom, it's an 'ion'
• Why do atoms have a neutral charge?

  Because they have the same number of positive protons and negative electrons, so the charges cancel out.