(c) Mendeleev was convinced of the importance of arranging elements in the periodic table in accordance with trends therefore he questioned the accuracy of the atomic masses of several elements. One place you can see this is in the fourth period; identify the elements involved, and explain why he questioned the atomic masses. ​

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).

2b2t

explanation:

2b2t

your answer is c) plasma

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