Multiple Choice
Which of the following lists contains only metalloids?
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2. Atoms & Elements
Periodic Table: Classifications
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Which term is used to describe the horizontal rows that run from left to right on the periodic table?
A
Families
B
Groups
C
Blocks
D
Periods
Verified step by step guidance1
Understand that the periodic table is organized into both horizontal and vertical arrangements to classify elements based on their properties.
Recognize that the vertical columns in the periodic table are called 'Groups' or 'Families', which contain elements with similar chemical properties.
Identify that the horizontal rows running from left to right are called 'Periods'. Each period corresponds to the filling of a principal energy level of electrons.
Note that 'Blocks' refer to sections of the periodic table (s, p, d, f blocks) based on the electron subshell being filled, not rows or columns.
Therefore, the term used to describe the horizontal rows that run from left to right on the periodic table is 'Periods'.
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