Element
Name
Symbol
Mass
Number
Atomic
Number
Number of
Protons
Number of
Neutrons
Number of
Electrons
Lithium
Carbon
Chlorine
Silver
Lead
Calcium
Tantalum
Radium
Samarium
Uranium
Americium
Lawrencium

The correct option is this: WHEN THE RESULTS DO NOT MATCH THE EXPERIMENTER PREDICTION.
In a situation where a researcher carry out an experiment and the experiment does not go as expected, a new discovery entirely may be made and this will results in carrying out new experiments to verify the new discovery.