The Atomic Model

• True or false? People used to believe that atoms were tiny sphere that could not be broken apart

  True
• Describe Rutherford and Marsden’s experience which disproved the plum pudding model.

  They fired alpha particles at gold foil.

  They found:

  1. some reflected back to the source
  2. some went through the foil
  3. Some deflected back towards the source

  This proved that the atoms was made up of mostly empty space
• What happens to an electron in an atom if it releases EM radiation?

  It transitions to a lower energy level becuase it was cause electrons to move closer to the nucleus.
• Who provided evidence for the existence of the neuton?

  James Chadwick
• True or false? Electrons make up most of an mass of an atom

  False
• What is the overall charge of an atom?

  The overall charge of an atom is neutral, meaning it has an equal number of protons and electrons.
• What happens to an atom if it loses one or more of its electrons?

  The loss of one or more electrons results in more protons than electrons and an overall positively charged ion