MULTIPLE CHOICE QUESTION Electrons fill in energy levels in which of the
following ways?

1.Lowest energy level first, so it fills in the inside
rings first

2.Lowest energy level first, so it fills in the
outside rings first

3.Highest energy level first, so it fills in the inside
rings first

4.Highest energy level first, so it fills in the outside
rings first

I think the answer is 3. Highest energy level first, so it fills in the inside rings first

not clear

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).