ATOMIC STRUCTURE AND RADIATION Flashcards
what is the radius of an atom
1 × 10-10 m
what is an atom mostly made up of
empty space
why might a scientific model be changed or replaced
scientists found new evidence
the discovery of the electron led to the Plum Pudding model of the atom. the Plum Pudding model suggested that the atom is…
a bundle of negative change with positives embedded in it
20 years after the nucleus had become an accepted scientific idea, the experimental work of James Chadwick provided evidence for the existence of…
neutrons
who provided evidence for the existence of the neutron
James Chadwick
unstable atoms give out radiation to become stable what is this process called
radioactive decay
activity is the rate at which a source of unstable nuclei decay. What is the unit of measurement for activity
Becquerel (Bq)
what device do we use to record count rate
Geiger-Muller tube
