isotone

(īsə tōn′)

noun

any atom with the same number of neutrons as another atom but a different atomic number

Origin: iso- + tone

See isotone in American Heritage Dictionary 4

noun
One of two or more atoms whose nuclei have the same number of neutrons but different numbers of protons.

Origin:

Origin: Alteration of isotope (with n for neutron replacing p as though for proton)

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