Question

elements are pure substances. they are organized in the periodic table. each element has a unique atomic structure and chemical symbol. the chemical symbol is either one or two letters, the first letter of which is capitalized. can you identify the elements? check the four symbols that represents single element. a co b ca c fe d h₂o e si f na

Explanation:

An element has a unique chemical symbol. CO is carbon - monoxide (a compound), H₂O is water (a compound). Ca is calcium, Fe is iron, Si is silicon, Na is sodium, all of which are elements.

Answer:

B. Ca, C. Fe, E. Si, F. Na