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Periodic Table: Classifications — Which element is the primary chemical basis of fossil fuels (coal, petroleum, and natural gas)?
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4. Atoms and Elements
Periodic Table: Classifications
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In the periodic table, what is each horizontal row called?
A
A block
B
A period
C
A family
D
A group
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Understand that the periodic table is organized in two main directions: horizontally and vertically.
Recognize that each horizontal row in the periodic table is called a 'period'.
Know that each vertical column is called a 'group' or 'family', which share similar chemical properties.
Identify that the term 'block' refers to sections of the periodic table based on electron configurations (s-block, p-block, d-block, f-block), not rows.
Therefore, the correct term for each horizontal row is 'period'.
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