Question

1. a horizontal row of elements in the periodic table is called a(n)

a. group.
b. family.
c. period.
d. octet.

Explanation:

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<reasoning>

Define periodic table rows

Horizontal rows are called periods, while vertical columns are called groups or families.

Identify the correct option

The question asks for a horizontal row, which corresponds to "period" (option c).
</reasoning>

<answer>
<mcq-option>a. group.</mcq-option>
<mcq-option>b. family.</mcq-option>
<mcq-correct>c. period.</mcq-correct>
<mcq-option>d. octet.</mcq-option>
</answer>

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"question_type": "Multiple Choice",
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Answer:

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<reasoning>

Define periodic table rows

Horizontal rows are called periods, while vertical columns are called groups or families.

Identify the correct option

The question asks for a horizontal row, which corresponds to "period" (option c).
</reasoning>

<answer>
<mcq-option>a. group.</mcq-option>
<mcq-option>b. family.</mcq-option>
<mcq-correct>c. period.</mcq-correct>
<mcq-option>d. octet.</mcq-option>
</answer>

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"question_type": "Multiple Choice",
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"Natural Science",
"Chemistry",
"Periodic Table Periods"
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