substâncias que não podem ser decompostos ou seja que não sofrem reação de decomposição são denominadas de que​

Chemical element, also called element, any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is composed.

Elemento químico, también llamado elemento, cualquier sustancia que no pueda descomponerse en sustancias más simples mediante procesos químicos ordinarios. Los elementos son los materiales fundamentales de los que se compone toda la materia.

Explanation:

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be