Answer:
C20
Explanation:
All the other options are compounds because they have more than one element in them.
Answer: 1. [tex]C_{20}[/tex]
Explanation:
Element is a pure substance which is composed of atoms of similar elements.It can not be decomposed into simpler constituents using chemical reactions.Example: Carbon [tex]C_{20}[/tex]
Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.It can be decomposed into simpler constituents using chemical reactions. Example: carbon monoxide [tex](CO)[/tex] , water [tex](H_2O)[/tex] and hydrogen carbonate [tex](H_2CO_3)[/tex]
Thus chemical symbol represents an element is [tex]C_{20}[/tex]
