Which of these is an element? A. Oxygen B. Air C. Water D. Sodium chlorine
Physics · Middle School · Thu Feb 04 2021
Answered on
Among the 4 choices, Oxygen is considered to be an element. Oxygen can be found in the periodic table of elements with an Atomic Number of 8 and O as the symbol. Air on the other hand is a mixture of variety of gases, that comprises the atmosphere, whereas for water and sodium chlorine, they are classified to be compounds which is a combination of 2 or more elements. We must not be confused of a compound and an element, since compounds contain two or more atoms of different elements, whereas an element has only one atom.
Final answer:
A. Oxygen