atomic number
(a-tom-ic-num-ber)
5 syllables
Definition
noun. The number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
Example Sentence
The atomic number of carbon is 6, indicating it has six protons in its nucleus.
More Example Sentences
Elements in the periodic table are arranged in order of increasing atomic number.
Synonyms
proton number; Z; element number
Antonyms
mass number; neutron number; atomic mass
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atomic number
