atomic core


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a·tom·ic core

the nucleus plus the nonvalence electrons.
References in periodicals archive ?
The nuclear fusions then create enough neutrons to trigger further fission reactions in the atomic core, steadily increasing the explosive power.
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.