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The atomic number of an element determines the number of protons that are present in that element. The atomic size refers to the distance that the outermost valence electrons are from the nucleus.

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9y ago
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14y ago

Atomic size increases along with atomic number from top to bottom in a single column of a Periodic Table. Across a row of a periodic table, size is more likely to decrease with increasing atomic number.

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12y ago

no difference. atomic number is the number of protons in an element. Atomic Mass is the total mass of protons, neutrons, and electrons in a single atom of the element.

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8y ago

atomic number represents the protons. mass number represents protons and neutrons.

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Q: What is the difference between atomic size and atomic number?
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