객관식
In Mendeleev’s original periodic table, what primary criterion did he use to arrange the elements?
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4. Atoms and Elements
Periodic Table: Classifications
Multiple Choice
In the periodic table, the horizontal rows are called what?
A
Groups
B
Periods
C
Series
D
Families
검증된 단계별 안내1
Understand that the periodic table is organized in two main directions: horizontal rows and vertical columns.
Recall that the vertical columns in the periodic table are called 'Groups' or 'Families', which share similar chemical properties.
Recognize that the horizontal rows in the periodic table are called 'Periods'. Each period corresponds to the filling of a different electron shell.
Note that 'Series' is not a standard term used to describe rows or columns in the periodic table.
Therefore, the correct term for the horizontal rows in the periodic table is 'Periods'.
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