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# Massachusetts Comprehensive Assessment System

## 2012, 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. The elements helium, neon, and xenon are located in group 18 (8A) in the periodic table.Explain why the atomic number increases from helium to neon to xenon.Explain why helium, neon, and xenon are located in different periods in the periodic table.Describe the chemical reactivity of helium, neon, and xenon and explain how the location of these elements in the periodic table relates to their chemical reactivity.

### 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 relationship of an element’s position in the periodic table to its atomic number and of identifying families and periods in the periodic table. The response explains why the atomic number increases from helium to neon to xenon and why helium, neon, and xenon are located in different periods in the periodic table. The response also describes the chemical reactivity of helium, neon, and xenon and explains how the location of these elements in the periodic table is related to their chemical reactivity.
4
3 The response demonstrates a general understanding of the relationship of an element’s position in the periodic table to its atomic number and of identifying families and periods in the periodic table.
2 The response demonstrates a limited understanding of the relationship of an element’s position in the periodic table to its atomic number and of identifying families and periods in the periodic table.
1 The response demonstrates a minimal understanding of the relationship of an element’s position in the periodic table to its atomic number and of identifying families and periods in the periodic table.
0 The 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: