An atom that gains an electron is called a(n)
a. proton
b. neutron
c. anion
d. cation

d.) the average kinetic energy of the gas particles is greater in container b because its particles move faster.

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.

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).