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In the periodic table, the horizontal rows are called which of the following?
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4. Atoms and Elements
Periodic Table: Classifications
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In the modern periodic table, elements are arranged primarily by increasing what property?
A
Number of neutrons
B
Density at room temperature
C
Atomic number (number of protons)
D
Atomic mass (average mass of the isotopes)
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Understand that the modern periodic table arranges elements based on a fundamental property that defines each element uniquely.
Recall that the atomic number represents the number of protons in the nucleus of an atom, which is unique for each element.
Recognize that while atomic mass and number of neutrons vary among isotopes, the atomic number remains constant for a given element.
Know that the periodic table is organized in order of increasing atomic number, which determines the element's identity and its position.
Therefore, the primary property used to arrange elements in the modern periodic table is the atomic number (number of protons).
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