Answer:
Explanation:
The elements are arranged in seven horizontal rows, called periods or series, and 18 vertical columns, called groups. Groups are labeled at the top of each column.
Answer
b
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Answers & Comments
Answer:
B. Periods
Explanation:
The elements are arranged in seven horizontal rows, called periods or series, and 18 vertical columns, called groups. Groups are labeled at the top of each column.
Answer
b
Explanation:
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