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- Integral number of protons in the nucleus; defines the identity of element.
- The number of positively charged protons in the nucleus of an atom.
Source: U.S. Nuclear Regulatory Commission
- Number of positive charges on nucleus of an atom; number of protons in nucleus.
Source: Leet, L. Don. 1982. Physical Geology, 6th Edition. Englewood Cliffs, NJ: Prentice-Hall
- The number of protons in the nucleus of an atom. See also: atomic weight
Source: Dictionary of Mining, Mineral, and Related Terms