Atoms of the same element that have different masses are called isotopes. Different masses result when there are different numbers of neutrons. All atoms of a particular element have the same number...
Definition of absent. 1 : not present at a usual or expected place : missing was absent from class today sharing memories of absent friends She was conspicously absent [=her absence was very noticeable] at the meeting. absently. adverb He replied absently to her question. Examples of absent in a sentence.
Isolated Meaning and Definition. ( 1 a.) Placed or standing alone; detached; separated from others. ( 2 imp. & 3  p. p.) of Isolate. 4  Alone, Detached, From, Isolate, Of, Or, Placed, Separated, Standing, 5  Apart, Detached, Disjunct, Marooned, Obscure, Quarantined, Scattered, Separated, Stranded, Stray,solated Meaning and Definition. ( 1 a.) Placed or standing alone; detached; separated from others. ( 2 imp. & 3  p. p.) of Isolate. 4  Alone, Detached, From, Isolate, Of, Or, Placed, Separated, Standing, 5  Apart, Detached, Disjunct, Marooned, Obscure, Quarantined, Scattered, Separated, Stranded, Stray,