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How are metals primarily designated in the periodic table based on their location?
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4. Atoms and Elements
Periodic Table: Classifications
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How are elements arranged in the modern periodic table?
A
In order of increasing atomic mass
B
Alphabetically by element symbol
C
In order of decreasing electronegativity
D
In order of increasing atomic number
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Understand that the modern periodic table is organized based on a fundamental property of elements called the atomic number, which is the number of protons in an atom's nucleus.
Recall that earlier versions of the periodic table, like Mendeleev's, arranged elements by increasing atomic mass, but this led to some inconsistencies in element properties.
Recognize that arranging elements by increasing atomic number resolves these inconsistencies because the atomic number uniquely identifies each element and determines its chemical behavior.
Know that the periodic table groups elements with similar chemical properties into columns called groups or families, and these groups repeat periodically as atomic number increases.
Therefore, the correct way elements are arranged in the modern periodic table is in order of increasing atomic number, not by atomic mass, alphabetically, or by electronegativity.
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