El radio de un átomo de hidrógeno es aproximadamente de 0.37 Å y el radio medio de la órbita terrestre alrededor del Sol es del orden de 1.5 x 108 km. Calcule la relación entre el radio promedio de la órbita terrestre y el radio del átomo de hidrógeno

Pegmatites are igneous rocks in which the individual minerals are very large. typically, the minerals are all light-colored quartz, feldspar and muscovite. if you were given a black and white photograph of a pegmatite in a quarry (where the rock has been blasted and broken), what physical properties could you use to identify those three minerals in this hypothetical photo? describe each mineral and the specific diagnostic properties. be specific.