Question

Which option is an element
A: carbon dioxide
B: Water
C: Air
D: Carbon

Answer 1

carbon is an element (D)

Step-by-step explanation:

An element is a substance composed of a single type of atom. In this case, only carbon is an element.

Answer 2

D: Carbon

Step-by-step explanation:

The periodic table lists all the known elements. When looking at it, the only choice you will find is carbon. Therefore, carbon is the element.

Carbon is also by itself, just C.

Water is H2O, which is a molecule due to the 2 different elements.

Carbon Dioxide is CO2, which is a molecule due to the 2 different elements.

Air is just a mixture of different gas molecules, so therefore it is not an element.