atomic core


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a·tom·ic core

the nucleus plus the nonvalence electrons.
References in periodicals archive ?
1979: There was a radiation leak alert at Three Mile Island nuclear station, near Harrisburg, Pennsylvania, when the atomic core began to melt down.
1979: There was a radiation leak alert at Three Mile Island nuclear station, Pennsylvania, when the atomic core began to melt down.
The nuclear fusions then create enough neutrons to trigger further fission reactions in the atomic core, steadily increasing the explosive power.