Inability to relate alpha emission to position of element in
Periodic Table
Inability to differentiate natural radioactivity from
artificial radioactivity, through their equations.
Poor conceptual understanding of half life of nuclei, &
give a name to the phenomenon
Inability to compare stability of elements based on their
half lives, on their proton/neutron ratio
Inability to calculate time taken for complete nuclear
decay
Inability to calculate mass of material that decayed over
time.
Inability to calculate half life from decay constant