Multiple Choice
Which element is classified as a metalloid on the periodic table?
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4. Atoms and Elements
Periodic Table: Classifications
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In the periodic table, what are the horizontal rows called?
A
Blocks
B
Groups
C
Families
D
Periods
Verified step by step guidance1
Understand that the periodic table is organized in two main directions: horizontally and vertically.
Recognize that the vertical columns in the periodic table are called 'Groups' or 'Families', which contain elements with similar chemical properties.
Know that the horizontal rows in the periodic table are called 'Periods'. Each period represents elements with the same number of electron shells.
Recall that '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 horizontal rows in the periodic table is 'Periods'.
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