Answer:
Carbon-element
Carbon dioxide-compound
Hydrogen-Element
Sodium chloride-Compound
Step-by-step explanation:
Element:It is a substance whose atoms all have the same number of protons.
It is chemically simplest substance and it can not be broken in smallest particle by chemical reactions.
Compound:It is substance which consist of two or more than two elements.
1.Carbon (C)
Using definition of element
Carbon is an element.
2.Carbon dioxide
Carbon dioxide is a compound because it consist of carbon and oxygen .
3.Hydrogen
It is an element because it cannot be broken down in small particles by chemical reaction.
4.NaCl
It is a compound because it consist of sodium and Cl -atom