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Learning Objective for EK 1.C.2:
LO 1.12 The student is able to explain why a given set of data suggests, or does not suggest, the need to refine the atomic model from a classical shell model with
the quantum mechanical model. [See SP 6.3]
Enduring understanding 1.D: Atoms are so small that they are difficult to study directly; atomic models are constructed to explain experimental data on collections of atoms.
Because the experimental measurement of ionization energy provides a window into the overall electronic structure of the atom, this content provides rich opportunities to explore how scientific models can be constructed and refined in response to available data. The modern use of mass spectrometry provides another example of how experimental data can be used to test or reject a scientific model.
LO 1.12 The student is able to explain why a given set of data suggests, or does not suggest, the need to refine the atomic model from a classical shell model with
the quantum mechanical model. [See SP 6.3]
Enduring understanding 1.D: Atoms are so small that they are difficult to study directly; atomic models are constructed to explain experimental data on collections of atoms.
Because the experimental measurement of ionization energy provides a window into the overall electronic structure of the atom, this content provides rich opportunities to explore how scientific models can be constructed and refined in response to available data. The modern use of mass spectrometry provides another example of how experimental data can be used to test or reject a scientific model.
Essential knowledge 1.D.2: An early model of the atom stated that all atoms of an element are identical. Mass spectrometry data demonstrate evidence that contradicts this early model.
a. Data from mass spectrometry demonstrate evidence that an early model of the atom (Dalton’s model) is incorrect; these data then require a modification of that
model.
b. Data from mass spectrometry also demonstrate direct evidence of different isotopes from the same element.
c. The average atomic mass can be estimated from mass spectra.
Learning Objective for EK 1.D.2:
LO 1.14 The student is able to use data from mass spectrometry to identify the elements and the masses of individual atoms of a specific element. [See SP 1.4, 1.5]
a. Data from mass spectrometry demonstrate evidence that an early model of the atom (Dalton’s model) is incorrect; these data then require a modification of that
model.
b. Data from mass spectrometry also demonstrate direct evidence of different isotopes from the same element.
c. The average atomic mass can be estimated from mass spectra.
Learning Objective for EK 1.D.2:
LO 1.14 The student is able to use data from mass spectrometry to identify the elements and the masses of individual atoms of a specific element. [See SP 1.4, 1.5]