Atomic number is the number of an atom's neurons neutrons electrons protons

Option (d) is the correct answer.

Explanation:

Atomic number is defined as the total number of protons present in an atom. Whereas mass number is the sum of total number of protons and neutrons present in an atom.

For example, atomic number of nitrogen is 7, this also means that there are 7 protons in a nitrogen atom.

Thus, we can conclude that atomic number is the number of an atom's protons.

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).