National Evaluation Series™ Profile: Chemistry (821)

Content Domain I: Matter and Its Interactions: Periodic Properties

Competencies:

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0001 Apply knowledge of atomic and subatomic structure and the principles of quantum theory.

Descriptive Statements:

Apply knowledge of historical atomic models to evaluate the development, strengths, and limitations of the models in representing atomic structure.
Demonstrate knowledge of the properties of nuclides (i.e., mass, charge, and nuclide ratio), the composition of isotopes, and the difference between average atomic mass and mass number.
Apply knowledge of the principles of quantum mechanics to atomic structure (e.g., electron configuration, ionization energy, electron affinity).
Apply knowledge of the relationships between electrons, energy levels, photons, the electromagnetic spectrum, and atomic spectra to interpret the electron configurations of atoms and ions.
Apply knowledge of the use of science and engineering practices in exploring and understanding content related to Objective 0001, such as asking questions and defining problems, developing and using models, planning and safely conducting investigations, analyzing and interpreting data, using mathematics and computational thinking, constructing explanations and designing solutions, engaging in argument from evidence, and communicating and evaluating data and conclusions.

Sample Item:

Use the table below to answer the question that follows.

Isotope	Average Atomic Mass (A M U)	Abundance (percent)
X 204	2 0 3 point 9 7 3	1 point 4
X 206	2 0 5 point 9 7 4	24 point 1
X 207	2 0 6 point 9 7 6	22 point 1
X 208	2 0 7 point 9 7 7	52 point 4

Element X is composed of four different isotopes. The masses and relative abundances of each isotope are listed in the table. Which of the following values represents the atomic mass of element X?

2 0 6 point 2 2 5 A M U
2 0 7 point 2 1 7 A M U
2 0 7 point 9 7 7 A M U
2 3 2 point 9 1 8 A M U

Correct Response and Explanation (Show Correct ResponseHide Correct Response)

Correct Response: B.

0002 Apply knowledge of periodic properties and the organization of the periodic table.

Descriptive Statements:

Apply knowledge of the organization of the periodic table and classification of elements to predict physical and chemical properties of a given element.
Apply knowledge of periodic trends (e.g., atomic radius, ionic radius, electronegativity).
Apply knowledge of valence electron configuration to predict ionic charges, oxidation states, and bonding patterns.
Apply knowledge of the use of science and engineering practices in exploring and understanding content related to Objective 0002, such as asking questions and defining problems, developing and using models, planning and safely conducting investigations, analyzing and interpreting data, using mathematics and computational thinking, constructing explanations and designing solutions, engaging in argument from evidence, and communicating and evaluating data and conclusions.

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