from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The number of protons in an atomic nucleus.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The number, equal to the number of protons in an atom that determines its chemical properties. Symbol: Z
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the order of an element in Mendeleyev's table of the elements; equal to the number of protons in the nucleus or electrons in the neutral state of an atom of an element
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