A period in the periodic table is the horizontal row of elements (option C).
What is a periodic table?
The periodic table is a tabular chart of the chemical elements according to their atomic numbers so that elements with similar properties are in the same group (column).
The periodic table arranges chemical elements into groups and periods. The vertical column is called the groups while the horizontal rows are called the periods.
In the periodic table, there are 7 periods and 18 groups that encompass the chemical elements.
Therefore, a period in the periodic table is the horizontal row of elements.
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