Mgx2 very low density highly reactive diatomic using the periodic table, determine which element these characteristics most likely describe. a)fluorine b)iodine c)oxygen d)sodium

Flourine

Explanation:

The answer is Flourine i guessed and got it right!

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation:

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).