Which one of the following statements is not correct?
A)Helium is an element.
B)Table salt (sodium chloride) is a compound.
C)Water is a pure substance.
D)Air is a solution.
E)Elements occur only in the form of individual atoms.

Question

Quizplus · Accepted Answer

This statement is not correct because elements can occur in the form of molecules, ions, or atoms. For example, oxygen can exist as O2 molecules, O^- ions, or individual O atoms.

Which One of the Following Statements Is Not Correct