Question

Two of the first known elements were

O carbon, sulfur
O gold, uranium
Ooxygen, iron
O graphite, diamond
and

Answer 1

Oxygen and iron are two of the first known elements.

Step-by-step explanation:

Two of the first known elements were oxygen and iron. Oxygen is a highly reactive nonmetallic element that is essential for respiration, combustion, and many other chemical reactions. Iron, on the other hand, is a metal that is widely used for its strength and durability.

Learn more about First known elements in chemistry