What frequency corresponds to an absorption line at 527 nm? A. 1.76 1014 Hz
B. 3.77 1014 Hz
C. 6.71 1014 Hz
D. 5.69 1014 Hz

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).

since electrons are negative the answer is neagtaive