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atomic number
This term is a precise scientific designation used exclusively within chemistry and physics. It serves as the primary identifier for an element, as no two different elements share the same atomic number. It is distinct from the mass number, which includes both protons and neutrons.
In a pedagogical or laboratory context, the term is used as a constant value. While the word "number" is typically countable, in this specific compound noun phrase, it refers to a unique property of an element rather than a quantity that is counted in sets.
Meanings
Examples
We must memorize every atomic number for the test.
The detective noticed the atomic number on the label.
The alchemist sought to change the atomic number of lead.
The periodic table is organized by increasing atomic number.
Nuclear synthesis alters the atomic number of the nucleus.