Are periods vertical or horizontal?
Understand the Problem
The question is asking whether periods (.) are visually represented as vertical or horizontal marks. It seeks clarification on the orientation or presentation of this punctuation mark.
Answer
Periods are horizontal rows on the periodic table.
The final answer is that periods are horizontal rows on the periodic table.
Answer for screen readers
The final answer is that periods are horizontal rows on the periodic table.
More Information
Periods are horizontal rows, and there are seven periods in the modern periodic table.
Tips
A common mistake is confusing periods and groups. Remember, periods go across, and groups go down.
Sources
- Modern Periodic Table: Periods and Groups - LibreTexts - chem.libretexts.org
- Period (periodic table) - Wikipedia - en.wikipedia.org
- The Periodic Table: Families and Periods - Dummies - dummies.com
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