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# Massachusetts Comprehensive Assessment System

## 2013, High School Chemistry

 Question 44: Open-Response Reporting Category: Atomic Structure and PeriodicityStandard: 3.1 - Explain the relationship of an element's position on the periodic table to its atomic number. Identify families (groups) and periods on the periodic table. Standard: 3.4 - Identify trends on the periodic table (ionization energy, electronegativity, and relative sizes of atoms and ions). Since elements are listed in the periodic table in order of increasing atomic number and arranged so that elements with similar properties fall into the same group, the periodic table can be used to predict similarities and differences between elements.Bromine and fluorine are both in group 17 (7A) of the periodic table. Describe two properties of bromine and fluorine that are the same.Bromine and fluorine are in different periods in the periodic table. Describe two properties of bromine and fluorine that are different.Based on their positions in the periodic table, bromine and fluorine are most likely to form ionic compounds with an element from which group: group 1 (1A), group 14 (4A), or group 18 (8A)? Explain your choice.

### Scoring Guide and Sample Student WorkSelect a score point in the table below to view the sample student response.

ScoreDescription
4 The response demonstrates a thorough understanding of the arrangement of the periodic table, periodic trends, and how to apply that knowledge to predict or compare the properties of elements based on their position in the table. The response clearly describes two valid similarities between the two elements and two valid differences between the two elements. The response also clearly explains why bromine and fluorine would most likely form ionic compounds with a group 1 (1A) element.
4
3
The response demonstrates a general understanding of the arrangement of the periodic table, periodic trends, and how to apply that knowledge to predict or compare the properties of elements based on their position in the table.
2
The response demonstrates a limited understanding of the arrangement of the periodic table, periodic trends, and how to apply that knowledge to predict or compare the properties of elements based on their position in the table.
1
The response demonstrates a minimal understanding of the arrangement of the periodic table, periodic trends, and how to apply that knowledge to predict or compare the properties of elements based on their position in the table.
0 Response is incorrect or contains some correct work that is irrelevant to the skill or concept being measured.

Note: There are 2 sample student responses for Score Point 4.

Question 11:
Question 23:
Question 33:
Question 44:
Question 45: