Part IV: Calculations 1. (12 points) Silicon has three common isotopes. The masses of the first two isotopes and
percent abundances are as follows: 27.9769 amu, 92.23%
28.9765 amu, 4.67%
If the atomic mass of silicon is 28.0855 amu, what is the percent abundance of the third
isotope? What is its atomic mass?

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).

answerambulatory;