Physical property definition simple

Why do isotopes have different properties?Differences in the properties of isotopes can be attributed to either of two causes: differences in mass or differences in nuclear structure. Scien. . When are isotopes stable?Isotopes are said to be stable if, when left alone, they show no perceptible tendency to change spontaneously. A uniform scale of nuclear stability. . How were isotopes discovered?The existence of isotopes emerged from two independent lines of research, the first being the study of radioactivity. The unambiguous confirmation. [pdf]
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