# Definition of chemical elements

Is oxygen gas a chemical element?
Is oxygen atom a chemical element?
The oxygen element in the periodic table actually refers to an oxygen atom or oxygen gas that exist naturally in our surrounding air/atmosphere?
Thanks to anyone that help and try to explain.

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dextercioby
Homework Helper
Ntzntz,conceptual quaestions... Open your text book & read the definition of a chemical element.See which option for $O_{2}$ fits the definition.

For the III-rd,u might remember the connection between Z,the element & the place in the periodic table.

Daniel.

GCT