Name:
ShortAnswer
1. ExplainthehistoricaldevelopmentoftheatomicmodelfromDemocritustoBohr.
2. Whatisthedifferencebetweenanemissionspectrumandanabsorptionspectrumforaspecific
element?
3. Whatdoesitmeantosaysomethingisradioactive?
PhysicsBModule12Homework
Directions:Completethefollowingproblemsshowingallofyourwork.Turnin
yourcompletedworksheettoyourteacher.
valeriia
the development of the atomic model from democritus to bohr was a long and complex
process involving many scientists and significant discoveries such as thomson and the
cathode ray tube and emest rutherford and the gold foil experiement. the modern atomic
model is the result of centuries of scientific inquiry and experementation and remains a
critical area of study in modern physics
the key difference between the two spectra is that an emission spectrum shows the
wavelengths of light that are emitted by an excited atom while an absorption spectrum
shows the wavelengths of light that are absorbed by an atom in its ground state. both
emission and absorption spectra are important tools for studying atomic behavior and
identifying elements
to say that something is radioactive means that it emits radiation in the form of particles or
waves as a result of its unstable atomic nucleus. atoms are made up of a nucleus of
protons and neutrons surrounded by electrons. in a stable atom the number of protons
and neutrons surrounded by electrons. in a stable atom the number of protons and
neutrons are balanced but in radioactrive atom the balance is disrupted and the nucleus
becomes unstable
