The elements, if arranged according to their atomic weights, exhibit an apparent periodicity of properties. Dmitri Mendeleev
The elements, if arranged according to their atomic weights, exhibit an apparent periodicity of properties.
Elements which are similar as regards their chemical properties have atomic weights which are either of nearly the same value (eg. Pt, Ir, Os) or which increase regularly (eg. K, Ru, Cs). Dmitri Mendeleev
Elements which are similar as regards their chemical properties have atomic weights which are either of nearly the same value (eg. Pt, Ir, Os) or which increase regularly (eg. K, Ru, Cs).
Thus the mercury at 4.2K has entered a new state, which, owing to its particular electrical properties, can be called the state of superconductivity. Heike Kamerlingh Onnes
Thus the mercury at 4.2K has entered a new state, which, owing to its particular electrical properties, can be called the state of superconductivity.
Isolating mechanisms are biological properties of individuals that prevent the interbreeding of populations that are actually or potentially sympatric. Ernst Mayr
Isolating mechanisms are biological properties of individuals that prevent the interbreeding of populations that are actually or potentially sympatric.
