Suppose the atoms in a two-dimensional crystal have the following arrangement: 
How many atoms are in one unit cell?
Definitions:
Seventeenth Century
The period from January 1, 1601, to December 31, 1700, marking the 17th century in the Gregorian calendar, noted for significant cultural, scientific, and geographical explorations.
North American Colonies
Territories in North America that were claimed, settled, and governed by European powers prior to becoming independent nations.
West Central Africa
A region in Africa that includes countries like Angola, Congo (Republic of the Congo and Democratic Republic of the Congo), and Cameroon, known for its rich history and diverse cultures.
Decades-long Wars
Conflicts that extend over a period of ten or more years, often characterized by prolonged battles and changing objectives.
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