The Tetragonal Crystal System Minimally Requires One Four-Fold Rotation Axis

question 22

Multiple Choice

The tetragonal crystal system minimally requires one four-fold rotation axis. Which of the following conditions on unit-cell edges and angles would satisfy this?

• A) a=b=c, a=b=g=90°
• B) a=b¹c, a=b=g=90°
• C) a=b=c, a=b=g¹90°
• D) a and b
• E) a and c

---

Definitions:

Socioeconomic-Status

An individual's or family's economic and social position in relation to others, based on income, education, and occupation.

Cigarettes

Thin cylinders of finely cut tobacco rolled in paper, intended for smoking, associated with health risks.

Experiment

A process in which an investigator, called an experimenter, devises two different experiences for participants and then studies and compares the outcomes.

Middle Adulthood

A stage of life, typically defined as the period between ages 40 to 65, characterized by stability, maturity, and increased responsibility.