Which of the following best describes an electron?

a. it has no charge and about the same mass as a proton.
b. it has a negative charge and much less mass than a proton.
c. it has a positive charge and much more mass than a neutron.
d. it has a negative charge and about the same mass as a neutron.

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.

Convert the temperature of dry ice, –77 ∞c, into degrees fahrenheit and kelvin.

Compare sympathetic and parasympathetic