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Elements in the periodic table are arranged in order by their:

A. Atomic number
B. Atomic mass (mass number)
C. Metal, nonmetal, or metalloid properties

Answer :

Final answer:

Elements in the periodic table are primarily arranged according to their atomic number, which indicates the number of protons in each element's nucleus. This arrangement helps to elucidate the relationships and properties of the elements. Atomic mass and classification by type are not the main methods of arrangement in the table.


Explanation:

Elements in the Periodic Table

The elements in the periodic table are arranged in order by their atomic number, which is the number of protons found in the nucleus of an atom of an element. This arrangement is fundamental to understanding the properties of the elements. For example, Hydrogen has an atomic number of 1, while Oxygen has an atomic number of 8, reflecting their position in the table.

While atomic mass (mass number) and the classification of elements as metals, nonmetals, or metalloids provide important information about the elements, the primary method of arrangement in the periodic table is based on atomic number. For instance, elements in the same group often share similar chemical properties, influenced significantly by their electronic configuration, which corresponds to their atomic number.


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