Help need asp thank you

10-A 11- I don't understand

Explanation:

I learned this stuff a few weeks ago! For 10., you have to find the number of Silicon atoms, or Si. There is only 1 Si, and there are no subscripts (little numbers after the element names) so the atoms are 1. If there is no subscript, it is 1, which means the answer is A. For the next question, I don't understand because the answers I'm coming up with are not an answer choice. Sorry for not being able to solve that one. Hope this helps!    

the solar system used to have much dust particles option no d

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).