Multiple Choice
Which of the following pairs of elements are in the same period of the periodic table?
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2. Atoms & Elements
Periodic Table: Classifications
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In the periodic table, what are the rows called?
A
Families
B
Periods
C
Groups
D
Blocks
Verified step by step guidance1
Understand that the periodic table is organized in two main directions: horizontally and vertically.
The horizontal rows in the periodic table are called \textbf{periods}. Each period corresponds to the filling of a different electron shell.
The vertical columns in the periodic table are called \textbf{groups} or \textbf{families}, which contain elements with similar chemical properties.
Blocks refer to sections of the periodic table based on the electron subshell being filled (s, p, d, f blocks), not rows or columns.
Therefore, the correct term for the rows in the periodic table is \textbf{periods}.
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