### Final Answer
The correct answer is **A. number of protons**.

### Explanation
In the periodic table, chemical elements are primarily organized by their atomic number, which corresponds to the number of protons found in the nucleus of an atom. This arrangement leads to a systematic progression in chemical properties, as elements with similar properties are grouped into columns, known as groups or families.

Other options like alphabetical order, abundance in the universe, size, or year of discovery do not dictate the arrangement of elements in the periodic table. For instance, while elements might be listed alphabetically in a different context, such organization does not reflect their chemical behavior.

The significance of the atomic number is profound; it determines an element’s identity and position in the periodic table, influencing its reactivity, electronegativity, and overall chemical behavior. Hence, the atomic number provides a logical basis for organizing the elements, making it a crucial factor in chemistry education and research.

Question

### Final Answer
The correct answer is **A. number of protons**.

### Explanation
In the periodic table, chemical elements are primarily organized by their atomic number, which corresponds to the number of protons found in the nucleus of an atom. This arrangement leads to a systematic progression in chemical properties, as elements with similar properties are grouped into columns, known as groups or families.

Other options like alphabetical order, abundance in the universe, size, or year of discovery do not dictate the arrangement of elements in the periodic table. For instance, while elements might be listed alphabetically in a different context, such organization does not reflect their chemical behavior.

The significance of the atomic number is profound; it determines an element’s identity and position in the periodic table, influencing its reactivity, electronegativity, and overall chemical behavior. Hence, the atomic number provides a logical basis for organizing the elements, making it a crucial factor in chemistry education and research.

Knowee AI · Accepted Answer

### Final Answer
The correct answer is **A. number of protons**.

### Explanation
In the periodic table, chemical elements are primarily organized by their atomic number, which corresponds to the number of protons found in the nucleus of an atom. This arrangement leads to a systematic progression in chemical properties, as elements with similar properties are grouped into columns, known as groups or families.

Other options like alphabetical order, abundance in the universe, size, or year of discovery do not dictate the arrangement of elements in the periodic table. For instance, while elements might be listed alphabetically in a different context, such organization does not reflect their chemical behavior.

The significance of the atomic number is profound; it determines an element’s identity and position in the periodic table, influencing its reactivity, electronegativity, and overall chemical behavior. Hence, the atomic number provides a logical basis for organizing the elements, making it a crucial factor in chemistry education and research.

In the periodic table, chemical elements are ordered by:A. number of protonsB. alphabetical orderC. abundance in the universeD. sizeE. year of discovery

Question

In the periodic table, chemical elements are ordered by:

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Final Answer

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