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How many periods (horizontal rows) are in the modern periodic table?
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4. Atoms and Elements
Periodic Table: Classifications
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How is the modern periodic table primarily arranged?
A
By grouping elements strictly by physical state at room temperature (solid, liquid, gas)
B
By increasing atomic mass from left to right across each period
C
By arranging elements in order of decreasing electronegativity from left to right
D
By increasing atomic number (number of protons) from left to right across each period
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Understand that the modern periodic table is organized based on the atomic number, which is the number of protons in an atom's nucleus.
Recognize that elements are arranged in rows called periods, where the atomic number increases from left to right across each period.
Know that this arrangement reflects the periodic law, which states that the properties of elements repeat periodically when elements are ordered by increasing atomic number.
Note that grouping elements by physical state or electronegativity is not the primary method of arrangement, although these properties can be observed within groups or periods.
Conclude that the modern periodic table's primary organization is by increasing atomic number, not by atomic mass or other properties.
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